Remove dev-v2 section for 2.10

RELEASENOTES.md

 # Release notes #
 
-### dev-v2 (not yet released) ###
-
 ### 2.10.0 ###
 
 * Core library:

build.gradle

@@ -36,7 +36,7 @@ allprojects {
         jcenter()
     }
     project.ext {
-        exoplayerPublishEnabled = false
+        exoplayerPublishEnabled = true
     }
     if (it.hasProperty('externalBuildDir')) {
         if (!new File(externalBuildDir).isAbsolute()) {