Pick up builds with libunwind patch (#8)

Author: es1024

setup.py

@@ -25,7 +25,7 @@
 
     setup(
         name='llvm-installer',
-        version='1.4.14',
+        version='1.4.15',
         url='https://github.com/yugabyte/llvm-installer',
         author='Mikhail Bautin',
         author_email='mbautin@users.noreply.github.com',