fix travis env var

Author: cp-bagerard

.pre-commit-config.yaml

@@ -4,7 +4,6 @@ repos:
       rev: 19.10b0
       hooks:
         - id: black
-#          language_version: python3
     - repo: https://gitlab.com/pycqa/flake8
       rev: 3.8.0a2
       hooks:

.travis.yml

@@ -33,7 +33,7 @@ env:
     - PYMONGO_3_9=3.9
     - PYMONGO_3_10=3.10
 
-    - MAIN_PYTHON_VERSION = "3.7"
+    - MAIN_PYTHON_VERSION=3.7
   matrix:
     - MONGODB=${MONGODB_3_4} PYMONGO=${PYMONGO_3_10}