Revert "add tap-spec to format output"

This reverts commit 63dfba065d.

test/render.test.js

@@ -3,12 +3,6 @@
 /* jshint node:true */
 
 var test = require('tape');
-var tapSpec = require('tap-spec');
-
-test.createStream()
-  .pipe(tapSpec())
-  .pipe(process.stdout);
-
 var mbgl = require('..');
 var fs = require('fs');
 var path = require('path');