Fix for Starlette CORS

The Starlette app with setting cors=true enables all origins, but only permits requests with the GET method. The CORSMiddleware for Starlette requires specifying `allow_methods=['*']` to enable all common request methods.

pygeoapi/starlette_app.py

@@ -637,7 +637,7 @@ async def __call__(self, scope: Scope,
 # CORS: optionally enable from config.
 if CONFIG['server'].get('cors', False):
     from starlette.middleware.cors import CORSMiddleware
-    APP.add_middleware(CORSMiddleware, allow_origins=['*'])
+    APP.add_middleware(CORSMiddleware, allow_origins=['*'], allow_methods=['*'])
 
 try:
     OGC_SCHEMAS_LOCATION = Path(CONFIG['server']['ogc_schemas_location'])