Advance versions from 1.0.0 to 1.0.1-pre1
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index b8dd2a7..1ca8119 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -35,7 +35,7 @@
 
 Pod::Spec.new do |s|
   s.name     = 'gRPC-Core'
-  version = '1.0.0'
+  version = '1.0.1-pre1'
   s.version  = version
   s.summary  = 'Core cross-platform gRPC library, written in C'
   s.homepage = 'http://www.grpc.io'