fix: change default minimum browser version to 64.0.3242

Thanks to @arkon for pointing out (thom4parisot/crx#102 (comment)) to check chrome/VERSION file.

lib/writeCRX3File.js

@@ -142,18 +142,19 @@ function writeFromListOfFiles (crxStream, files) {
 /**
  * Require minimum browser version.
  *
- * Guessed by date when Chromium was switched to generate CRX3 packages,
- * and Chrome version number around 1 year later.
+ * Guessed by date when Chromium was switched to generate CRX3 packages (October 16, 2017).
  *
  * Chrome made CRX3 mandatory in version 73.0.3683.
  *
  * @see
  *   [Chromium commit]{@link https://chromium.googlesource.com/chromium/src.git/+/b8bc9f99ef4ad6223dfdcafd924051561c05ac75}
  * @see
- *   [Chrome versions]{@link https://en.wikipedia.org/wiki/Google_Chrome_version_history}
+ *   [Chrome version at that commit]{@link https://chromium.googlesource.com/chromium/src/+/b8bc9f99ef4ad6223dfdcafd924051561c05ac75/chrome/VERSION}
+ * @see
+ *   [Chrome version history]{@link https://en.wikipedia.org/wiki/Google_Chrome_version_history}
  * @private
  */
-const BROWSER_VERSION_MINIMUM = '70';
+const BROWSER_VERSION_MINIMUM = '64.0.3242';
 
 /**
  * Write Update Manifest template.
@@ -163,15 +164,13 @@ const BROWSER_VERSION_MINIMUM = '70';
  *
  * @see
  *   [Update Manifest]{@link https://developer.chrome.com/extensions/linux_hosting#update_manifest}
- * @see
- *   [Chrome Versions]{@link https://en.wikipedia.org/wiki/Google_Chrome_version_history}
  * @private
  * @param {string} filePath
  * @param {string} appId
  * @param {Object} [info]
  * @param {string} [info.version='${APP_VERSION}']
  * @param {string} [info.url='${CRX_URL}']
- * @param {string} [info.browser='70']
+ * @param {string} [info.browser='64.0.3242']
  */
 function writeUpdateManifestXML (filePath, appId, info = {}) {
 	info.version = info.version || process.env.APP_VERSION || '${APP_VERSION}';