chore: Automatic git push after release (#226)

.travis.yml

@@ -37,7 +37,15 @@ notifications:
 after_success:
   - |
     if [ "${WILL_RELEASE}" == 0 ]; then
-      git checkout master;
+      git config --global user.email webapp+travis@wire.com
+      git config --global user.name "Wire Travis CI"
+      mkdir -p temp
+      openssl aes-256-cbc -K $encrypted_d95474b06f11_key -iv $encrypted_d95474b06f11_iv -in deploy.enc -out temp/deploy -d
+      chmod 600 temp/deploy
+      eval `ssh-agent -s`
+      ssh-add deploy
+      rm -rf temp
       echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" >> "${HOME}/.npmrc" && \
+      git checkout master;
       yarn release;
     fi