README.md: Specify Python 2 in run commands

On modern Linux distributions, __python__ is Python 3.

Author: cclauss

README.md

@@ -77,21 +77,21 @@ How to use it
 ```
 git clone https://github.com/jofpin/trape.git
 cd trape
-python trape.py -h
+python2 trape.py -h
 ```
 If it does not work, try to install all the libraries that are located in the file **requirements.txt**
 ```
-pip install -r requirements.txt
+python2 -m pip install -r requirements.txt
 ```
 
 Example of execution
 ```
-Example: python trape.py --url http://example.com --port 8080
+Example: python2 trape.py --url http://example.com --port 8080
 ```
 
 **HELP  AND OPTIONS**
 ```
-user:~$ python trape.py --help
+user:~$ python2 trape.py --help
 usage: python trape.py -u <> -p <> [-h] [-v] [-u URL] [-p PORT]
                                               [-ak ACCESSKEY] [-l LOCAL]
                                               [--update] [-n] [-ic INJC]