Update version number to 1.3.0.dev0

Signed-off-by: NJames Myatt <james@jamesmyatt.co.uk>

src/paho/mqtt/__init__.py

-__version__ = "1.2.2"
+__version__ = "1.3.0.dev0"
+
+VERSION_MAJOR = 1
+VERSION_MINOR = 3
+VERSION_REVISION = 0
+VERSION_NUMBER = (VERSION_MAJOR * 1000000 + VERSION_MINOR * 1000 + VERSION_REVISION)
+
 
 class MQTTException(Exception):
     def __init__(self, *args, **kwargs):

src/paho/mqtt/client.py

@@ -59,11 +59,6 @@ if platform.system() == 'Windows':
 else:
     EAGAIN = errno.EAGAIN
 
-VERSION_MAJOR = 1
-VERSION_MINOR = 2
-VERSION_REVISION = 2
-VERSION_NUMBER = (VERSION_MAJOR * 1000000 + VERSION_MINOR * 1000 + VERSION_REVISION)
-
 MQTTv31 = 3
 MQTTv311 = 4