Merge pull request #174 from browserstack/LOC-5083_add_arm64_support

[LOC-5083] Add support for Linux arm64 binary

Author: yashdsaraf

lib/LocalBinary.js

@@ -15,6 +15,7 @@ const packageName = 'browserstack-local-nodejs';
 function LocalBinary(){
   this.hostOS = process.platform;
   this.is64bits = process.arch == 'x64';
+  this.isArm64 = process.arch == 'arm64';
   this.baseRetries = 9;
   this.sourceURL = null;
   this.downloadErrorMessage = null;
@@ -71,7 +72,9 @@ function LocalBinary(){
       this.windows = true;
       return sourceURL + 'BrowserStackLocal.exe';
     } else {
-      if(this.is64bits) {
+      if(this.isArm64) {
+        return sourceURL + 'BrowserStackLocal-linux-arm64';
+      } else if(this.is64bits) {
         if(this.isAlpine())
           return sourceURL + 'BrowserStackLocal-alpine';
         else