Prepare for release 0.12.6.

Author: yuxincs

Diff for: CHANGELOG.md

@@ -1,5 +1,12 @@
 Changelog
 =========
+Version 0.12.6
+---------------
+* JSpecify: view type as super in generic method inference (#1177)
+* Infer @Nullable type arguments for type variables from unmarked code (#1181)
+* Convert android-jar.py to Python 3 (#1175)
+* Suggest castToNonNull fix for unboxing error (#1182)
+
 Version 0.12.5
 ---------------
 * Add missing override to RestoreNullnessAnnotationsVisitor (#1154)

Diff for: gradle.properties

@@ -12,7 +12,7 @@ org.gradle.caching=true
 org.gradle.jvmargs=-Xmx2g -XX:MaxMetaspaceSize=512m
 
 GROUP=com.uber.nullaway
-VERSION_NAME=0.12.6-SNAPSHOT
+VERSION_NAME=0.12.6
 
 POM_DESCRIPTION=A fast annotation-based null checker for Java