docs: document change in top-level dependencies (#915)

This change adds information about top-level dependencies of the package
to various places of its docs.

Follow-up to #914

CONTRIBUTING.md

@@ -75,6 +75,7 @@ You can use our Docker image to avoid setting up the development environment you
 
 - Python 2.7 and 3.4+
 - [python_http_client](https://github.com/sendgrid/python-http-client)
+- [ecdsa_python](https://github.com/starkbank/ecdsa-python)
 
 ##### Initial setup: #####
 

FIRST_TIMERS.md

@@ -6,7 +6,7 @@
  - [Setting up the Development Environment](#setup)
  - [Proposing Change through a Pull Request](#pr)
  - [Be Patient & Wait for reviews](#reviews)
- 
+
  <a name="explore"></a>
  ### Explore Twilio SendGrid
 Step 1: Get yourself Access to Twilio SendGrid API Service absolutely free from [here](https://sendgrid.com/free/?source=sendgrid-python)\
@@ -15,8 +15,8 @@ Step 2: Get familiar with Twilio SendGrid Service
  - Set up your [Twilio SendGrid API Key](https://app.sendgrid.com/settings/api_keys) to your local workspace [using](https://github.com/sendgrid/sendgrid-python#setup-environment-variables)
  - Install Twilio SendGrid to your workspace using `pip install sendgrid`
  - Copy & Run few sample programs from [here](https://github.com/sendgrid/sendgrid-python#hello-email)
- 
- 
+
+
  <a name="issues"></a>
  ### Raise Issues
  Twilio SendGrid uses GitHub as the content management service so, all the issues related to the project be it some feature request or a bug report, all are reported at the [GitHub Issue Tracker](https://github.com/sendgrid/sendgrid-python/issues)\
@@ -27,16 +27,16 @@ Step 2: Get familiar with Twilio SendGrid Service
   If you encounter any sort of bug or abnormal behavior, feel free to inform the community after performing the following checks:
     - Update to the latest version & check if the bug persists
     - Check the Issue Tracker for any similar bug report
-    
+
   Finally fill up the Bug Report Template & Open the Issue highlighting your encountered bug & detailed steps to regenerate the bug.
-  
+
   <a name="setup"></a>
   ### Setting up the Development Environment
    - **Using Docker**\
    Use our Docker image to avoid setting up the development environment yourself. See [USAGE.md](https://github.com/sendgrid/sendgrid-python/blob/master/docker/USAGE.md)
-   
+
    - **Setting up Locally**\
-   Step 1: Install the Prerequistes: Any Version of Python(2.6 through 3.6) & [python_http_client](https://github.com/sendgrid/python-http-client)\
+   Step 1: Install the Prerequistes: Any Version of Python (2.6 through 3.6) and both [python_http_client](https://github.com/sendgrid/python-http-client) and [ecdsa_python](https://github.com/starkbank/ecdsa-python)\
    Step 2: Get a local copy of repository using `git clone https://github.com/sendgrid/sendgrid-python.git`\
    Step 3: Set your [Twilio SendGrid API Key](https://app.sendgrid.com/settings/api_keys) to your local workspace using\
     `echo "export SENDGRID_API_KEY='YOUR_API_KEY'" > sendgrid.env`\
@@ -46,28 +46,28 @@ Step 2: Get familiar with Twilio SendGrid Service
    - **/examples** contains *Working examples that demonstrate usage*
    - **/tests** contains *the unit and profiling tests*
    - **/sendgrid** contains *the Web API v3 client ie sendgrid.py and other files*.
-   
-   
+
+
   <a name="pr"></a>
   ## Proposing Change through a Pull Request
   **Step 1:** Fork the project & Clone your fork using `git clone https://github.com/<USERNAME>/sendgrid-python.git`
-  
+
   **Step 2:** Reconfigure the remotes using `cd sendgrid-python` and `git remote add upstream https://github.com/sendgrid/sendgrid-python.git`
-  
+
   **Step 3:** Create a new branch for your modifications using `git checkout -b <topic-branch-name>`
-  
+
   **Step 4:** Commit the changes in logical chunks & add commit messages strictly following [this](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
-  
+
   **Step 5:** Run all test locally, [for more info](https://github.com/sendgrid/sendgrid-python/blob/master/CONTRIBUTING.md#testing)
-  
+
   **Step 6:** Locally merge your the upstream development branch into your topic-branch using `git pull [--rebase] upstream master`
-  
+
   **Step 7:** Push the topic branch up to your fork using `git push origin <topic-branch-name>`
-  
+
   **Step 8:** Open a Pull Request with clear title and description against the master branch.
 
   <a name="reviews"></a>
   ## Be Patient & Wait for Reviews
   Kindly be patient & follow the suggestions as provided by the peer reviewers. Make required amendments & changes to the PR as asked.
-  
+
 ## [Explore New Issues to work upon](https://github.com/sendgrid/sendgrid-python/labels/difficulty%3A%20easy)

README.md

@@ -77,6 +77,7 @@ pip install sendgrid
 ## Dependencies
 
 - [Python-HTTP-Client](https://github.com/sendgrid/python-http-client)
+- [ECDSA-Python](https://github.com/starkbank/ecdsa-python)
 
 
 <a name="quick-start"></a>

README.rst

@@ -93,6 +93,7 @@ Dependencies
 ------------
 
 -  `Python-HTTP-Client`_
+-  `ECDSA-Python`_
 
 Quick Start
 ===========
@@ -272,6 +273,7 @@ License
 .. _Twilio account: https://www.twilio.com/try-twilio?source=sendgrid-python
 .. _SENDGRID_API_KEY: https://app.sendgrid.com/settings/api_keys
 .. _Python-HTTP-Client: https://github.com/sendgrid/python-http-client
+.. _ECDSA-Python: https://github.com/starkbank/ecdsa-python
 .. _/mail/send Helper: https://github.com/sendgrid/sendgrid-python/tree/master/sendgrid/helpers/mail
 .. _personalization object: https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/personalizations.html
 .. _Fluent Interface: https://sendgrid.com/blog/using-python-to-implement-a-fluent-interface-to-any-rest-api/