VersionHelper now correctly strip snapshot info

Author: cmaglie

arduino-core/src/cc/arduino/contributions/VersionHelper.java

@@ -38,6 +38,10 @@ public static Version valueOf(String ver) {
       return null;
     }
     try {
+      if (ver.contains("-")) {
+        // Strip snapshot info
+        ver = ver.split("-")[0];
+      }
       String[] verParts = ver.split("\\.");
       if (verParts.length < 3) {
         if (verParts.length == 2) {