Prepare v0.1.1 release

Author: rdoursenaud

src/midi_const/__init__.py

@@ -15,7 +15,7 @@
   http://amei.or.jp/midistandardcommittee
 """
 
-__version__ = "0.1.0.post1"
+__version__ = "0.1.1"
 
 VERSIONS = {
     1: "1.0",