fix(handlers): Handle DELETE for environment sensors

It now works as advertised in the README! *ahem*...

handlers/sensors.go

@@ -11,7 +11,7 @@ import (
 	"git.hamburg.ccc.de/ccchh/spaceapid/types"
 )
 
-func EnvironmentSensor(
+func EnvironmentSensorPUT(
 	authDB config.HTTPBACredentials, validCredentials []config.HTTPBACredentialID,
 	resp *types.EnvironmentSensor,
 ) func(http.ResponseWriter, *http.Request) {
@@ -35,3 +35,20 @@ func EnvironmentSensor(
 		resp.LastChange = time.Now().Unix()
 	}
 }
+
+func EnvironmentSensorDELETE(
+	authDB config.HTTPBACredentials, validCredentials []config.HTTPBACredentialID,
+	resp *types.EnvironmentSensor,
+) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		_, err := updateEndpointValidator(authDB, validCredentials, w, r)
+		if err != nil {
+			log.Println(err)
+			return
+		}
+
+		// Set SpaceAPI response values
+		resp.Value = 0
+		resp.LastChange = time.Now().Unix()
+	}
+}