Update configurator-pg to 0.2.0 (better error messages) (#1457)

* Don't indent first line of configuration parser error messages

configurator-pg returns multi-line errors now. Alternatively,
we could indent all the lines.

src/PostgREST/Config.hs

@@ -140,7 +140,7 @@ readOptions = do
   -- Now read the actual config file
   conf <- catches (C.load cfgPath)
     [ Handler (\(ex :: IOError)    -> exitErr $ "Cannot open config file:\n\t" <> show ex)
-    , Handler (\(C.ParseError err) -> exitErr $ "Error parsing config file:\n\t" <> err)
+    , Handler (\(C.ParseError err) -> exitErr $ "Error parsing config file:\n" <> err)
     ]
 
   case C.runParser parseConfig conf of