Update contributing docs and the README for 1.3.1

CONTRIBUTING.md

@@ -31,7 +31,8 @@ Here are the steps, which should be automated but aren't (PR
 welcome!):
 
   1. write release notes in NEWS.md following the format
-     already in there. commit.
+     already in there. update README with the new version.
+     Commit.
   2. create a signed git tag "vX.Y.Z"
   3. start sbt; `show version` should confirm that the version was
      taken from the tag
@@ -52,8 +53,8 @@ welcome!):
       (latest/api should be mostly just changed timestamps)
   14. push gh-pages
   15. log into sonatype website and go through the usual hoops
-      (search for com.typesafe, verify the artifacts in it, close,
-      release)
+      (under Staging Repositories, search for com.typesafe, verify the
+      artifacts in it, close, release)
   16. push the "vX.Y.Z" tag
   17. announce release, possibly wait for maven central to sync
       first

README.md

@@ -106,12 +106,12 @@ You can find published releases on Maven Central.
     <dependency>
         <groupId>com.typesafe</groupId>
         <artifactId>config</artifactId>
-        <version>1.3.0</version>
+        <version>1.3.1</version>
     </dependency>
 
 sbt dependency:
 
-    libraryDependencies += "com.typesafe" % "config" % "1.3.0"
+    libraryDependencies += "com.typesafe" % "config" % "1.3.1"
 
 Link for direct download if you don't use a dependency manager:
 
@@ -766,7 +766,7 @@ Currently the library is maintained against Java 8, but
 version 1.2.1 and earlier will work with Java 6.
 
 Please use 1.2.1 if you need Java 6 support, though some people
-have expressed interest in a branch off of 1.3.0 supporting
+have expressed interest in a branch off of 1.3.x supporting
 Java 7. If you want to work on that branch you might bring it up
 on [chat](https://gitter.im/typesafehub/config). We can release a
 jar for Java 7 if someone(s) steps up to maintain the branch. The