Update hashin in requirements.txt from 0.11.5 to 0.12.0

[dependencies]

Dependencies.io has updated hashin (a pypi dependency in requirements.txt) from "0.11.5" to "0.12.0".

0.12.0

: - Switch from pypi.python.org/pypi/<package>/json to
pypi.org/pypi/<package>/json which also means the sha256 hash
is part of the JSON payload immediately instead of having to
download and run pip to get the hash.
- Testing no runs Python 2.6 and Python 3.3.
- All hashes, per package, are sorted (by the hash) to make it
more predictable.

0.11.5

: - You can now pass PEP-0496 Environment Markers together with the
package name, and they get passed into the requirements.txt
file. Thanks meejah

0.11.4

: - PackageErrors happening in CLI suppressed just the error message
out on stderr. No full traceback any more.

0.11.3

: - Better error if you typo the package name since it'll 404 on
PyPI.

0.11.2

: - Run continuous integration tests with Python 3.6 too.

0.11.1

: - Ability to run hashin --version to see what version of hashin
is installed. See peterbe/hashin#41

0.11.0

: - Cope with leading zeros in version numbers when figuring out
what the latest version is. See
peterbe/hashin#39

0.10.0

: - Latest version is now figured out by looking at all version
numbers in the list of releases from the JSON payload. The pre
releases are skipped.

0.9.0

: - Fixed a bug where it would fail to install a package whose name
is partially part of an existing (installed) package. E.g.
installing redis==x.y.z when django-redis==a.b.c was already
in the requirements file.

0.8.0

: - Ability to make hashin work as a library. Thanks jayfk !
- pep8 cleanups.

0.7.2

: - Fixes bug related to installing platform specific archives See
peterbe/hashin#33 Thanks mythmon

0.7.1

: - Package matching is now case insensitive. E.g. hashin dJaNgO

0.7.0

: - The requirements file and algorithm arguments are now keyword
arguments. Now, the second, third, nth positional argument are
additional arguments. Thanks https://github.com/ahal

0.6.1

: - Support windows binaries packaged as a .msi file.

0.6.0

: - Fix compatibility issue with pip 8.1.2 and 8.1.1-2ubuntu0.1 and
drop support for Python 2.6

0.5.0

: - Important bug fix. As an example, if you had
pytest-selenium==... already in your requirements.txt file
and add selenium==x.y.z it would touch the line with
pytest-selenium too.

0.4.1

: - Support for PyPI links that have a hash in the file URL.

0.4.1

: - Fix PackageError if no Python version is defined.

0.4

: - Add filtering of package releases by Python version.

0.3

: - Issue a warning for users of Python before version 2.7.9.

0.2

: - Last character a single newline. Not two.

0.1

: - First, hopefully, working version.