Update build.py to new buildlib

Fix README.md formatting

Author: Eloston

README.md

@@ -9,7 +9,7 @@ ungoogled-chromium is a set of configuration flags, patches, and custom scripts.
 * Strip binaries from the source tree, and use those provided by the system or build them from source
 * Add, modify, or disable features that inhibit control and transparency (these changes are minor and do not have significant impacts on the general user experience)
 
-
+Table of Contents
 * [Features](#features)
     * [Supported platforms and distributions](#supported-platforms-and-distributions)
 * [Download pre-built packages](#download-pre-built-packages)

build.py

@@ -31,7 +31,7 @@
 
 def main():
     try:
-        builder = buildlib.Builder()
+        builder = buildlib.get_builder()
         # Modify builder's attributes as necessary. See the Builder class for options
         builder.check_build_environment()
         builder.setup_chromium_source()