Fix sinonjs#1746: Remove dependency on ES2015 code from post-install …

…script

This allows Sinon to be installed by legacy node versions.

scripts/support-sinon.js

@@ -1,12 +1,18 @@
 "use strict";
 /* eslint-disable no-console */
 
-var color = require("../lib/sinon/color");
+var green = "\u001b[32m";
+var white = "\u001b[22m\u001b[39m";
+var boldCyan = "\u001b[96m\u001b[1m";
+var reset = "\u001b[0m";
 
 var output =
-    color.green(
-        "Have some ❤️  for Sinon? You can support the project via Open Collective:"
-    ) +
-    color.white("\n > ") +
-    color.cyan(color.bold("https://opencollective.com/sinon/donate\n"));
+    green +
+    "Have some ❤️  for Sinon? You can support the project via Open Collective:" +
+    white +
+    "\n > " +
+    boldCyan +
+    "https://opencollective.com/sinon/donate\n" +
+    reset;
+
 console.log(output);