Fix versions to comply with pep440

Author: deathaxe

README.rst

@@ -7,7 +7,7 @@
         | |_) || |_| || |_|  __/
         | .__/  \__, | \__|\___|
         | |      __/ |
-        |_|     |___/      0.8.3dev
+        |_|     |___/      0.8.3.dev
 
 
 What is ``pyte``?

docs/conf.py

@@ -52,7 +52,7 @@
 # The short X.Y version.
 version = '0.8.3'
 # The full version, including alpha/beta/rc tags.
-release = '0.8.3dev'
+release = '0.8.3.dev'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.