Bumping version to 4.0.1

Author: ashfurrow

Nimble.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "Nimble"
-  s.version      = "4.0.0"
+  s.version      = "4.0.1"
   s.summary      = "A Matcher Framework for Swift and Objective-C"
   s.description  = <<-DESC
                    Use Nimble to express the expected outcomes of Swift or Objective-C expressions. Inspired by Cedar.