Add v8 heap statistics to Health endpoint (#106)

diff --git a/provider/lib/health.js b/provider/lib/health.js
index ecfba29..bbdc01d 100644
--- a/provider/lib/health.js
+++ b/provider/lib/health.js
@@ -1,4 +1,5 @@
 var si = require('systeminformation');
+var v8 = require('v8');
 
 module.exports = function(utils) {
 
@@ -24,6 +25,8 @@
             stats.disk = results[2];
             stats.network = results[3];
             stats.apiHostLatency = results[4];
+            stats.heapStatistics = v8.getHeapStatistics();
+            stats.heapSpaceStatistics =v8.getHeapSpaceStatistics();
             res.send(stats);
         })
         .catch(error => {