Escape % on Windows

Not escaping can cause expansion of environment variables. This combined
with the fact that variables in Windows are case-insensitive, `%cI%` has
the potential to cause a lot of harm, given the fact that `CI=true` is
set for virtually every NPM Continuous Integration build.

Author: AbhyudayaSharma

src/GitInfo.macro.js

@@ -7,7 +7,12 @@ const parsedGitLog = (() => {
   const commit = {};
   // only the commit message can have multiple lines. Make sure to always add at the end:
   // The format is specified in https://git-scm.com/docs/git-log#_pretty_formats
-  const logResult = execSync('git log --format="%D%n%h%n%H%n%cI%n%B" -n 1 HEAD')
+  let gitCommand = 'git log --format=%D%n%h%n%H%n%cI%n%B -n 1 HEAD';
+  if (process.platform === 'win32') {
+    gitCommand = gitCommand.replace(/%/g, '^%'); // need to escape percents in batch
+  }
+
+  const logResult = execSync(gitCommand)
     .toString()
     .trim()
     .split(/\r?\n/);