Merge pull request #786 from p4lang/P4-16-v1.2.0

Update version to 1.2.0 for release

Author: jnfoster

p4-16/spec/P4-16-spec.mdk

@@ -1,5 +1,5 @@
 Title : P4~16~ Language Specification
-Title Note: version 1.2.0-rc
+Title Note: version 1.2.0
 Title Footer: &date;
 Author: The P4 Language Consortium
 Heading depth: 5