removed Java 7 as an option on README.

README.md

@@ -91,7 +91,7 @@ Swagger Codegen Version | Release Date | OpenAPI Spec compatibility | Notes
 
 
 ### Prerequisites
-If you're looking for the latest stable version, you can grab it directly from Maven.org (Java 7 runtime at a minimum):
+If you're looking for the latest stable version, you can grab it directly from Maven.org (Java 8 runtime at a minimum):
 
 ```sh
 wget http:https://central.maven.org/maven2/io/swagger/swagger-codegen-cli/3.0.0-rc0/swagger-codegen-cli-3.0.0-rc0.jar -O swagger-codegen-cli.jar
@@ -108,12 +108,12 @@ brew install swagger-codegen
 
 To build from source, you need the following installed and available in your $PATH:
 
-* [Java 7 or 8](http:https://java.oracle.com)
+* [Java 8](http:https://java.oracle.com)
 
 * [Apache maven 3.3.3 or greater](http:https://maven.apache.org/)
 
 #### OS X Users
-Don't forget to install Java 7 or 8. You probably have 1.6.
+Don't forget to install Java 8. You probably have 1.6 or 1.7.
 
 Export JAVA_HOME in order to use the supported Java version:
 ```sh