2.0.0

• #1: Return status code 201 instead of 404 for unknown checks to prevent Freshping from hammering our server with retries that won't succeed.
• #2: Prevent alerts from going unresolved when multiple checks have the same integration key and they are both down at the same time.
• ⚠ Breaking change: configure Freshping checks by numeric ID instead of name, because the name can be changed later in Freshping.