remove version and Mocha check from snapshot

__snapshots__/mocha-snapshot-spec.js

@@ -9,13 +9,13 @@ exports['captures mocha output 1'] = `
 
   stdout:
   -------
-  > cypress@0.20.1 test-mocha <folder path>
+  > cypress@x.y.z test-mocha <folder path>
   > mocha --reporter spec scripts/spec.js
 
 
 
     mocha sanity check
-      ✓ works
+      Y works
 
 
     1 passing (<time>ms)

scripts/mocha-snapshot-spec.js

@@ -7,6 +7,9 @@ function normalize (s) {
   // using forward slashes
   return s.replace(process.cwd(), '<folder path>')
     .replace(/passing \(\d+ms\)/, 'passing (<time>ms)')
+    .replace(/cypress@(\d+\.\d+\.\d+)/, 'cypress@x.y.z')
+    .replace(/✓/g, 'Y') // Mocha check on Mac
+    .replace(/√/g, 'Y') // Mocha check on Windows
 }
 
 /* eslint-env mocha */