update micro version number

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/PythonLanguage.java

@@ -111,7 +111,7 @@ public final class PythonLanguage extends TruffleLanguage<PythonContext> {
     public static final String NAME = "Python";
     public static final int MAJOR = 3;
     public static final int MINOR = 7;
-    public static final int MICRO = 0;
+    public static final int MICRO = 3;
     public static final String VERSION = MAJOR + "." + MINOR + "." + MICRO;
 
     public static final String MIME_TYPE = "text/x-python";