fix: provide bundlers alternate file for browser support (#58)

Author: Christian Compton

auth/utils/read-credentials-file.browser.ts

@@ -0,0 +1,4 @@
+// Dummy for browser
+export function readCredentialsFile() {
+  return {};
+};

package.json

@@ -70,6 +70,9 @@
     "semver": "^6.2.0",
     "vcap_services": "~0.3.4"
   },
+  "browser": {
+    "./auth/utils/read-credentials-file": "./auth/utils/read-credentials-file.browser"
+  },
   "engines": {
     "node": ">=10"
   },