Start work on todo.txt parser

stack.yaml

@@ -15,7 +15,7 @@
 # resolver:
 #  name: custom-snapshot
 #  location: "./custom-snapshot.yaml"
-resolver: lts-11.11
+resolver: lts-12.9
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
@@ -40,6 +40,8 @@ packages:
 # Dependency packages to be pulled from upstream that are not in the resolver
 # (e.g., acme-missiles-0.3)
 # extra-deps: []
+extra-deps:
+- ConfigFile-1.1.4
 
 # Override default flag values for local packages and extra-deps
 # flags: {}