Base the beta build off of the next minor version

bin/publish.js

@@ -32,13 +32,15 @@ function getNextVersion(tag) {
     console.error('The package.json version must be of the form x.y.z');
     process.exit(1);
   }
-  const publishedVersions = getPublishedVersions(packageJson.version, tag);
+  const stableVersion = packageJson.version.split('.');
+  const nextStableVersion = `${stableVersion[0]}.${parseInt(stableVersion[1]) + 1}.${stableVersion[2]}`;
+  const publishedVersions = getPublishedVersions(nextStableVersion, tag);
   if (publishedVersions.length === 0) {
     return `${packageJson.version}-${tag}1`;
   }
   const latestPublishedVersion = publishedVersions.sort((a, b) => b.localeCompare(a))[0];
   const latestTagVersion = parseInt(latestPublishedVersion.substr(latestPublishedVersion.search(/[0-9]+$/)), 10);
-  return `${packageJson.version}-${tag}${latestTagVersion + 1}`;
+  return `${nextStableVersion}-${tag}${latestTagVersion + 1}`;
 }
 
 function getPublishedVersions(version, tag) {

package.json

@@ -1,7 +1,7 @@
 {
   "name": "xterm",
   "description": "Full xterm terminal, in your browser",
-  "version": "3.13.0",
+  "version": "3.12.0",
   "main": "lib/public/Terminal.js",
   "types": "typings/xterm.d.ts",
   "repository": "https://github.com/xtermjs/xterm.js",
@@ -61,4 +61,4 @@
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
     "watch": "tsc -b -w ./src/tsconfig.all.json --preserveWatchOutput"
   }
-}
+}