Update README.md to refer to 1.7.

Fixes #343,#352,#350

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=243715974

README.md

@@ -13,7 +13,7 @@
 and run it with:
 
 ```
-java -jar /path/to/google-java-format-1.6-all-deps.jar <options> [files...]
+java -jar /path/to/google-java-format-1.7-all-deps.jar <options> [files...]
 ```
 
 The formatter can act on whole files, on limited lines (`--lines`), on specific
@@ -92,15 +92,15 @@ configuration.
 <dependency>
   <groupId>com.google.googlejavaformat</groupId>
   <artifactId>google-java-format</artifactId>
-  <version>1.6</version>
+  <version>1.7</version>
 </dependency>
 ```
 
 #### Gradle
 
 ```groovy
 dependencies {
-  compile 'com.google.googlejavaformat:google-java-format:1.6'
+  compile 'com.google.googlejavaformat:google-java-format:1.7'
 }
 ```