Refactor: prep to turn class methods into instance

... in order to make a single Cardinality instance persist across
updates to expectation cardinality. This include a 'times' method. To
make space for it, the existing protected 'times' method has been
renamed to 'count'.

lib/mocha/cardinality.rb

@@ -62,21 +62,21 @@ def anticipated_times
       if allowed_any_number_of_times?
         'allowed any number of times'
       elsif required.zero? && maximum.zero?
-        "expected #{times(maximum)}"
+        "expected #{count(maximum)}"
       elsif required == maximum
-        "expected exactly #{times(required)}"
+        "expected exactly #{count(required)}"
       elsif infinite?(maximum)
-        "expected at least #{times(required)}"
+        "expected at least #{count(required)}"
       elsif required.zero?
-        "expected at most #{times(maximum)}"
+        "expected at most #{count(maximum)}"
       else
-        "expected between #{required} and #{times(maximum)}"
+        "expected between #{required} and #{count(maximum)}"
       end
     end
     # rubocop:enable Metrics/CyclomaticComplexity,Metrics/PerceivedComplexity
 
     def invoked_times
-      "invoked #{times(@invocations.size)}"
+      "invoked #{count(@invocations.size)}"
     end
 
     def actual_invocations
@@ -87,7 +87,7 @@ def actual_invocations
 
     attr_reader :required, :maximum
 
-    def times(number)
+    def count(number)
       case number
       when 0 then 'never'
       when 1 then 'once'