update bin/ruby-build version. It's missing bump. We need to fix next version...

hsbt · hsbt · commit 1b8bbf6a6fea · 2016-09-16T12:50:24.000+09:00
diff --git a/bin/ruby-build b/bin/ruby-build
@@ -13,7 +13,7 @@
 #   --version        Show version of ruby-build
 #
 
-RUBY_BUILD_VERSION="20160602"
+RUBY_BUILD_VERSION="20160913"
 
 OLDIFS="$IFS"
 

Original file line number	Diff line number	Diff line change
`@@ -13,7 +13,7 @@`
`13`	`13`	`# --version Show version of ruby-build`
`14`	`14`	`#`
`15`	`15`
`16`		`-RUBY_BUILD_VERSION="20160602"`
	`16`	`+RUBY_BUILD_VERSION="20160913"`
`17`	`17`
`18`	`18`	`OLDIFS="$IFS"`
`19`	`19`