Fix typos (#3)

README.md

@@ -21,7 +21,7 @@ You should have [hastic-server](https://github.com/hastic/hastic-server) running
 
 - open new dasboard where you want to see Hastic panel
 - open Dashboard `Settings` (top right corner) and then `Varables` 
-- Add new `Constant` [variable](http://docs.grafana.org/reference/templating/#variable-types) with `name` equals to `$HASTIC_SERVER_URL` and `value` with URL of your hastic-server instance (e.g. `http://localhost:8000`) in your dashboard
+- Add new `Constant` [variable](http://docs.grafana.org/reference/templating/#variable-types) with `name` equals to `HASTIC_SERVER_URL` and `value` with URL of your hastic-server instance (e.g. `http://localhost:8000`) in your dashboard
 - Save settings and close Settings window
 - set one metrics in `Metrics` tab. Only one metric suported
 - go to `Analytics tab` and create new anomaly

src/module.ts

@@ -21,7 +21,7 @@ import config from 'grafana/app/core/config';
 
 import _ from 'lodash';
 
-const BACKEND_VARIABLE_NAME = "HASTIC_SERVER_URL";
+const BACKEND_VARIABLE_NAME = 'HASTIC_SERVER_URL';
 
 
 class GraphCtrl extends MetricsPanelCtrl {
@@ -195,17 +195,17 @@ class GraphCtrl extends MetricsPanelCtrl {
   }
 
   get backendURL(): string {
-    if(this.templateSrv.index['HASTIC_SERVER_URL'] === undefined) {
+    if(this.templateSrv.index[BACKEND_VARIABLE_NAME] === undefined) {
       return undefined;
     }
-    return this.templateSrv.index['HASTIC_SERVER_URL'].current.value;
+    return this.templateSrv.index[BACKEND_VARIABLE_NAME].current.value;
   }
 
   async runBackendConnectivityCheck() {
     if(this.backendURL === '' || this.backendURL === undefined) {
       this.alertSrv.set(
         `Dashboard variable $${BACKEND_VARIABLE_NAME} is missing`, 
-        'Please set $${BACKEND_VARIABLE_NAME} ', 
+        `Please set $${BACKEND_VARIABLE_NAME}`, 
         'warning', 4000
       );
       return;