Prepare versions and change log for release 7.0.0 (#311)

Author: devchas

CHANGELOG.md

@@ -1,3 +1,9 @@
+7.0.0 - 2020-07-23
+------------------
+- Generated library with a new build system. A side effect of that change is
+  that certain overloaded method signatures containing boolean flags for making
+  requests have been removed.
+
 6.0.0 - 2020-07-17
 ------------------
 - Added support for Google Ads API v4_0.

README.md

@@ -18,7 +18,7 @@ This project hosts the Java client library for the Google Ads API.
     <dependency>
       <groupId>com.google.api-ads</groupId>
       <artifactId>google-ads</artifactId>
-      <version>6.0.0</version>
+      <version>7.0.0</version>
     </dependency>
 
 ## Documentation