commit ef243d5058964672a26c144180e0ea6b71066e32
Author: Tom Hughes <tom@compton.nu>
Date:   Fri Aug 23 19:05:34 2019 +0100

    Handle beta versions of python

diff --git a/lib/configure.js b/lib/configure.js
index 0f7c19b..cfe2b43 100644
--- a/lib/configure.js
+++ b/lib/configure.js
@@ -461,6 +461,10 @@ PythonFinder.prototype = {
         this.log.silly('stripping "rc" identifier from version')
         version = version.replace(/rc(.*)$/ig, '')
       }
+      if (~version.indexOf('b')) {
+        this.log.silly('stripping "b" identifier from version')
+        version = version.replace(/b(.*)$/ig, '')
+      }
       var range = semver.Range('>=3.7.0 <4.0.0')
       var valid = false
       try {