Fixes a typo

.drone.yml

@@ -7,14 +7,14 @@ pipeline:
   dependencies:
     image: golang:1.11
     environment:
-      - GO111MODULES=on
+      - GO111MODULE=on
     commands:
       - go get -u 
 
   test:
     image: golang:1.11
     environment:
-      - GO111MODULES=on
+      - GO111MODULE=on
       - TOKEN_PRIVATE_KEY=test_private_key
       - POSTGRES_USER=test_user
       - POSTGRES_PASSWORD=xxxx
@@ -30,7 +30,7 @@ pipeline:
   build:
     image: golang:1.11
     environment:
-      - GO111MODULES=on
+      - GO111MODULE=on
     commands:
       - go build git.packetlostandfound.us/chiefnoah/baka-moe-ws/cmd/bakamoews
       - pwd