Merge branch 'master' into beta

lib/git.js

@@ -16,7 +16,7 @@ Object.assign(gitLogParser.fields, {hash: 'H', message: 'B', gitTags: 'd', commi
  */
 async function getTagHead(tagName, execaOpts) {
   try {
-    return await execa.stdout('git', ['rev-list', '-1', tagName], execaOpts);
+    return (await execa('git', ['rev-list', '-1', tagName], execaOpts)).stdout;
   } catch (error) {
     debug(error);
   }
@@ -31,7 +31,7 @@ async function getTagHead(tagName, execaOpts) {
  * @throws {Error} If the `git` command fails.
  */
 async function getTags(execaOpts) {
-  return (await execa.stdout('git', ['tag'], execaOpts))
+  return (await execa('git', ['tag'], execaOpts)).stdout
     .split('\n')
     .map(tag => tag.trim())
     .filter(Boolean);
@@ -167,8 +167,8 @@ async function fetch(repositoryUrl, branch, execaOpts) {
  *
  * @return {String} the sha of the HEAD commit.
  */
-function getGitHead(execaOpts) {
-  return execa.stdout('git', ['rev-parse', 'HEAD'], execaOpts);
+async function getGitHead(execaOpts) {
+  return (await execa('git', ['rev-parse', 'HEAD'], execaOpts)).stdout;
 }
 
 /**
@@ -180,7 +180,7 @@ function getGitHead(execaOpts) {
  */
 async function repoUrl(execaOpts) {
   try {
-    return await execa.stdout('git', ['config', '--get', 'remote.origin.url'], execaOpts);
+    return (await execa('git', ['config', '--get', 'remote.origin.url'], execaOpts)).stdout;
   } catch (error) {
     debug(error);
   }
@@ -286,7 +286,7 @@ async function verifyBranchName(branch, execaOpts) {
  * @return {Boolean} `true` is the HEAD of the current local branch is the same as the HEAD of the remote branch, falsy otherwise.
  */
 async function isBranchUpToDate(repositoryUrl, branch, execaOpts) {
-  const remoteHead = await execa.stdout('git', ['ls-remote', '--heads', repositoryUrl, branch], execaOpts);
+  const {stdout: remoteHead} = await execa('git', ['ls-remote', '--heads', repositoryUrl, branch], execaOpts);
   try {
     return await isRefInHistory(remoteHead.match(/^(\w+)?/)[1], branch, false, execaOpts);
   } catch (error) {