Update version for podspec to not include dot (#6111)

Protobuf.podspec

diff --git a/Protobuf.podspec b/Protobuf.podspec
index bf66f4c..f657d3d 100644
--- a/Protobuf.podspec
+++ b/Protobuf.podspec
@@ -5,7 +5,7 @@
 # dependent projects use the :git notation to refer to the library.
 Pod::Spec.new do |s|
   s.name     = 'Protobuf'
-  s.version  = '3.8.0-rc.1'
+  s.version  = '3.8.0-rc1'
   s.summary  = 'Protocol Buffers v.3 runtime library for Objective-C.'
   s.homepage = 'https://github.com/protocolbuffers/protobuf'
   s.license  = '3-Clause BSD License'

update_version.py

diff --git a/update_version.py b/update_version.py
index dd01d83..ab203d6 100755
--- a/update_version.py
+++ b/update_version.py
@@ -220,7 +220,7 @@
   RewriteTextFile('Protobuf.podspec',
     lambda line : re.sub(
       r"^  s.version  = '.*'$",
-      "  s.version  = '%s'" % GetFullVersion(rc_suffix = '-rc.'),
+      "  s.version  = '%s'" % GetFullVersion(rc_suffix = '-rc'),
       line))