update master to 2.0, because the 1.0release branch is created. 2.0.0

@@ -29,7 +29,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 // current release version
-#define VERSION_MAJOR "1"
+#define VERSION_MAJOR "2"
 #define VERSION_MINOR "0"
 #define VERSION_REVISION "0"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION