gen-changelog: change default branch to latest

Credit: @zkat
Reviewed-By: @iarna

scripts/changelog.js

@@ -5,14 +5,14 @@ Usage:
 node scripts/changelog.js [comittish]
 
 Generates changelog entries in our format as best as its able based on
-commits starting at comittish, or if that's not passed, master.
+commits starting at comittish, or if that's not passed, latest.
 
 Ordinarily this is run via the gen-changelog shell script, which appends
 the result to the changelog.
 
 */
 const execSync = require('child_process').execSync
-const branch = process.argv[2] || 'master'
+const branch = process.argv[2] || 'latest'
 const log = execSync(`git log --reverse --pretty='format:%h %H%d %s (%aN)%n%b%n---%n' ${branch}...`).toString().split(/\n/)
 
 main()