Update the CHANGELOG, mention that the minimum Go version got bumped

Sam Stenvall · Sam Stenvall · commit a308c4efe392 · 2017-05-22T17:06:51.000+03:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## 2.0.0
 
 * moved project to UpCloud's own GitHub organization
+* raise the minimum required Go version to 1.7
 
 ## 1.1.0
 
