Update Travis to test with 1.2.0 driver

Author: jmikola

.travis.yml

@@ -13,15 +13,15 @@ env:
     - MONGO_REPO_TYPE="precise/mongodb-enterprise/"
     - SOURCES_LOC="/etc/apt/sources.list.d/mongodb.list"
   matrix:
-    - DRIVER_VERSION=1.2.0alpha3 SERVER_VERSION=2.6
-    - DRIVER_VERSION=1.2.0alpha3 SERVER_VERSION=3.0
-    - DRIVER_VERSION=1.2.0alpha3 SERVER_VERSION=3.2
+    - DRIVER_VERSION=1.2.0 SERVER_VERSION=2.6
+    - DRIVER_VERSION=1.2.0 SERVER_VERSION=3.0
+    - DRIVER_VERSION=1.2.0 SERVER_VERSION=3.2
 
 matrix:
   fast_finish: true
   include:
     - php: 7.0
-      env: DRIVER_VERSION=1.2.0alpha3 SERVER_VERSION=2.4
+      env: DRIVER_VERSION=1.2.0 SERVER_VERSION=2.4
     - php: 7.0
       env: DRIVER_VERSION=devel SERVER_VERSION=3.2
   exclude: