Bump to 0.1.1 to prepare for next version

composer.json

 {
   "name": "adi-ia/dnumber-client-php",
   "description": "A PHP client for interacting with the DoIT Number API",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "license": "Apache-2.0",
   "homepage": "https://git.doit.wisc.edu/adi-ia/dnumber-client-php",
   "authors": [