Add alpha-3 release to releases plugin versions (#164)

Author: jimkyndemeyer

alpha-releases/JS GraphQL-2.0.0-alpha-3.zip

@@ -1,3 +1,3 @@
 <plugins>
-    <plugin id="com.intellij.lang.jsgraphql" url="https://github.com/jimkyndemeyer/js-graphql-intellij-plugin/blob/v2/alpha-releases/JS%20GraphQL-2.0.0-alpha-2.zip?raw=true" version="2.0.0-alpha-2"/>
+    <plugin id="com.intellij.lang.jsgraphql" url="https://github.com/jimkyndemeyer/js-graphql-intellij-plugin/blob/v2/alpha-releases/JS%20GraphQL-2.0.0-alpha-3.zip?raw=true" version="2.0.0-alpha-3"/>
 </plugins>