fix travis

.travis.yml

   - master
   - v2
 
-git:
-  depth: 9999999
-
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
   - rm -fr $HOME/.gradle/caches/*/plugin-resolution/

scripts/release.js

 function calcNewVersion() {
   const packageVersion = semver.clean(process.env.npm_package_version);
   console.log(`package version: ${packageVersion}`);
+  exec.execSync(`git fetch`);
   const commitCount = exec.execSyncRead(`git rev-list --count ${ONLY_ON_BRANCH}`);
-  console.log(`new patch: ${commitCount}`);
+  console.log(`commits in ${ONLY_ON_BRANCH}: ${commitCount}`);
   return `${semver.major(packageVersion)}.${semver.minor(packageVersion)}.${commitCount}`;
 }