Add go.mod file

.build.yml

@@ -13,17 +13,17 @@ packages:
   - build-essential
 
 tasks:
-  - install go: |
+  - install_go: |
       SECONDS=0
 
       wget https://golang.org/dl/go1.16.4.linux-amd64.tar.gz
-      rm -rf /usr/local/go && tar -C /usr/local -xzf go1.16.4.linux-amd64.tar.gz
-      export PATH=$PATH:/usr/local/go/bin
+      sudo tar -C /usr/local -xzf go1.16.4.linux-amd64.tar.gz
+      sudo ln -s /usr/local/go/bin/go /usr/bin/go
 
       duration=$SECONDS
       echo "Task completed in $(($duration / 60))m$(($duration % 60))s."
 
-  - run tests: |
+  - run_tests: |
       cd twitter_offline_engine/scraper
 
       go test -bench=.

go.mod

@@ -0,0 +1,3 @@
+module offline_twitter
+
+go 1.16