False as the default plot configuration value if the field is missing.

Fixes #17

saqc/core/reader.py

@@ -24,7 +24,7 @@ CONFIG_TYPES = {
     F.START: pd.to_datetime,
     F.END: pd.to_datetime,
     F.TESTS: str,
-    F.PLOT: lambda v: str(v).lower() != "false",
+    F.PLOT: lambda v: str(v).lower() == "true",
     F.LINENUMBER: int,
 }