Update changelog and version number

Author: dean0x7d

changelog.md

@@ -1,9 +1,9 @@
 # Changelog
 
-### v0.8.1 | in development
+### v0.8.1 | 2016-11-11
 
 * Structure plotting functions have been improved with better automatic scaling of lattice site
-  radii and hopping line widths.
+  circle sizes and hopping line widths.
 
 * Fixed Brillouin zone calculation for cases where the angle between lattice vectors is obtuse
   ([#1](https://github.com/dean0x7d/pybinding/issues/1)). Thanks to
@@ -14,6 +14,9 @@
 
 * Fixed missing CUDA source files in PyPI sdist package.
 
+* Revised advanced installation instructions: compiling from source code and development.
+
+
 ### v0.8.0 | 2016-07-01
 
 ##### New features

pybinding/__about__.py

@@ -1,6 +1,6 @@
 """Package for numerical tight-binding calculations in solid state physics"""
 __title__ = "pybinding"
-__version__ = "0.8.1.dev"
+__version__ = "0.8.1"
 __summary__ = "Package for tight-binding calculations"
 __url__ = "https://github.com/dean0x7d/pybinding"