Set podspec version statically

Podspecs are standalone files.

Partially reverts 4cbf935dea.

TunnelKit.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name              = "TunnelKit"
-    s.version           = File.read("ci/VERSION")
+    s.version           = "1.1.0"
     s.summary           = "Non-official OpenVPN client for Apple platforms."
 
     s.homepage          = "https://github.com/keeshux/tunnelkit"

ci/set_version.sh

@@ -4,3 +4,6 @@ VERSION=`cat $PWD/VERSION`
 BUILD=`git rev-list HEAD --count`
 agvtool new-marketing-version $VERSION
 agvtool new-version $BUILD
+
+echo "Setting podspec version to $VERSION..."
+sed -i "" -E 's@s\.version( +)= "[0-9]+\.[0-9]+\.[0-9]+"$@s.version\1= "'$VERSION'"@g' TunnelKit.podspec