fixed forge installer url

Author: AbrarSyed

src/main/java/net/minecraftforge/gradle/patcher/PatcherConstants.java

@@ -10,7 +10,7 @@ private PatcherConstants() {}
 
     // installer stuff
     static final String REPLACE_INSTALLER        = "{INSTALLER}";
-    static final String INSTALLER_URL            = "http://files.minecraftforge.net/installer/forge-installer-" + REPLACE_INSTALLER + "-shrunk.jar";
+    static final String INSTALLER_URL            = "http://files.minecraftforge.net/maven/net/minecraftforge/installer/" + REPLACE_INSTALLER + "/installer-" + REPLACE_INSTALLER + "-shrunk.jar";
 
     // new project defaults
     static final String DEFAULT_PATCHES_DIR      = "patches";