Update .travis.yml (#12)

.travis.yml

@@ -13,15 +13,18 @@ addons:
       - build-essential
 env:
   global:
-    - GOV=1.9
+    - GOV=1.9.2
+    - GOSHA="de874549d9a8d8d8062be05808509c09a88a248e77ec14eb77453530829ac02b  go${GOV}.linux-amd64.tar.gz"
     - GOPATH=$HOME/go
     - GOROOT=$HOME/$GOV/go
     - PATH=$GOROOT/bin:$PATH:$GOPATH/bin
   matrix:
-    - V=4.4.1
+    - V=4.3.3
 before_install:
   - install -d $GOPATH $GOROOT
   - wget https://storage.googleapis.com/golang/go$GOV.linux-amd64.tar.gz
+  - echo "${GOSHA}" > .gosha
+  - sha256sum --check .gosha
   - tar -C $HOME/$GOV -xzf go$GOV.linux-amd64.tar.gz
   - node --version
   - yarn versions