fix --no-consul.health-summary typo in README

Author: rmrf

README.md

@@ -46,7 +46,7 @@ make
     Consul API queries to gather all information about each service. Health check
     information are available via `consul_health_service_status` as well, but
     only for services which have a health check configured. Defaults to true.
-    Disable using `--no-consul.heatlh-summary`.
+    Disable using `--no-consul.health-summary`.
 * __`consul.key-file`:__ File path to a PEM-encoded private key used with the
     certificate to verify the exporter's authenticity.
 * __`consul.insecure`:__ Disable TLS host verification.