(bug) Removed depricated "await" from memory.js

- browser.controlFlow().await() is depricated -- use wait()
- Otherwise fails in protractor v2.5.1

lib/memory.js

@@ -82,7 +82,7 @@ module.exports.startMemoryMeasurement = function (test, options, time, graphData
             }
 
             if (graphFilename && options.generateGraph) {
-                browser.controlFlow().await(
+                browser.controlFlow().wait(
                     generateGraph.phantomRender(graphFilename, graphData, options.graphWidth, options.graphHeight)
                 ).then(function () {
                         console.log('Graph generated: ' + graphFilename);