Remove unknown version of mongoengine

Author: wcdolphin

.travis.yml

@@ -8,10 +8,17 @@ python:
 env:
   - PYMONGO=dev MONGOENGINE=dev
   - PYMONGO=dev MONGOENGINE=0.7.10
-  - PYMONGO=dev MONGOENGINE=0.8.0RC2
+  - PYMONGO=dev MONGOENGINE=0.8.0
+  - PYMONGO=dev MONGOENGINE=0.8.7
   - PYMONGO=2.5 MONGOENGINE=dev
   - PYMONGO=2.5 MONGOENGINE=0.7.10
-  - PYMONGO=2.5 MONGOENGINE=0.8.0RC2
+  - PYMONGO=2.5 MONGOENGINE=0.8.0
+  - PYMONGO=2.5 MONGOENGINE=0.8.7
+  - PYMONGO=2.7 MONGOENGINE=dev
+  - PYMONGO=2.7 MONGOENGINE=0.7.10
+  - PYMONGO=2.7 MONGOENGINE=0.8.0
+  - PYMONGO=2.7 MONGOENGINE=0.8.7
+
 install:
     - if [[ $PYMONGO == 'dev' ]]; then pip install https://github.com/mongodb/mongo-python-driver/tarball/master; true; fi
     - if [[ $PYMONGO != 'dev' ]]; then pip install pymongo==$PYMONGO --use-mirrors; true; fi