Proper semver check in update

lib/controller.js

@@ -7,6 +7,7 @@ var async = require('async');
 var colors = require('colors');
 var inquirer = require('inquirer');
 var sprintf = require('sprintf-js').sprintf;
+var semver = require('semver');
 
 // Internal
 var discover = require('./discover');
@@ -846,7 +847,6 @@ controller.update = function(opts) {
           return versionFromSHA.then(function(currentVersionInfo) {
             var build = updates.findBuild(builds, 'version', version);
             var verifiedVersion;
-
             // If the update is forced or this version was requested,
             // and a valid build exists for the version provided.
             if (version && build) {
@@ -872,7 +872,7 @@ controller.update = function(opts) {
               }
 
               // Check if the current build is the same or newer if this isn't a forced update
-              if (!opts.force && currentVersionInfo.version >= verifiedVersion) {
+              if (!opts.force && semver.gte(currentVersionInfo.version, verifiedVersion)) {
                 // If it's not, close the Tessel connection and print the error message
                 var message = tessel.name + ' is already on the latest firmware version (' + currentVersionInfo.version + '). You can force an update with "t2 update --force".';