prepare release 0.19.3

Author: mxm

CHANGES.txt

@@ -5,7 +5,7 @@ Changes for crate
 Unreleased
 ==========
 
-2017/05/17 0.19.3
+2017/05/18 0.19.3
 =================
 
  - Fix bulk updates which were broken due to query rewrites.

src/crate/client/__init__.py

@@ -24,7 +24,7 @@
 
 # version string read from setup.py using a regex. Take care not to break the
 # regex!
-__version__ = "0.19.2"
+__version__ = "0.19.3"
 
 apilevel = "2.0"
 threadsafety = 2