Added versioneer to better manage the versions (#124)

* Added versioneer to better manage the versions

Author: hmaarrfk

.gitattributes

@@ -0,0 +1 @@
+picoscope/_version.py export-subst

.travis.yml

@@ -5,7 +5,7 @@ python:
   - "3.6"
   - "3.7-dev"
 
-install: pip install flake8
+install: pip install flake8 versioneer
 
 script: 
    - flake8 picoscope setup.py

MANIFEST.in

@@ -1,3 +1,5 @@
 include README.md
 include LICENSE.md
 include examples/*.py
+include versioneer.py
+include picoscope/_version.py

README.md

@@ -102,9 +102,7 @@ Alternatively, you can follow more thorough instructions
 [here](http://scikit-image.org/docs/dev/contribute.html).
 
 # Developer notes
-To update versions, change it in `picoscope/__init__.py`, `__version__ = "X.Y.Z"`
-
-Once the versions have been updated, commit and create a new tag with git
+Commit and create a new tag with git
 ```
 git commit
 git tag -a X.Y.Z -m "Short descriptive message"
@@ -120,4 +118,5 @@ or to push all tags
 git push --tags
 ```
 
+[versioneer](https://github.com/warner/python-versioneer) takes care of updating the version.
 New tags will be pushed to PyPi automatically by Travis.

picoscope/__init__.py

@@ -1,6 +1,5 @@
 __author__ = "Colin O'Flynn, Mark Harfouche"
 __license__ = "FreeBSD"
-__version__ = "0.7.1"
 
 __all__ = ["ps2000",
            "ps2000a",
@@ -10,3 +9,7 @@
            "ps4000a",
            "ps5000a",
            "ps6000"]
+
+from ._version import get_versions
+__version__ = get_versions()['version']
+del get_versions