83 (#84)

* #83 - Fixing the bug that was preventing the status update

* #83 - Refactoring unit tests for configuration to ensure we catch more cases

cachet_url_monitor/exceptions.py

@@ -17,3 +17,13 @@ class MetricNonexistentError(Exception):
 
     def __str__(self):
         return repr(f'Metric with id [{self.metric_id}] does not exist.')
+
+
+class ConfigurationValidationError(Exception):
+    """Exception raised when there's a validation error."""
+
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return repr(self.value)