Changed version to 2.2.1-dev (#243)

Author: eernstg

specification/dartLangSpec.tex

@@ -15,7 +15,7 @@
 \makeindex
 \title{Dart Programming Language Specification\\
 {5th edition draft}\\
-{\large Version 2.2}}
+{\large Version 2.2.1-dev}}
 \author{}
 
 % For information about Location Markers (and in particular the