Modified due_date column to check that it's a date TODO:add func is broke now

src/dodo.schema

@@ -3,8 +3,12 @@ CREATE TABLE tasks(
 	title TEXT NOT NULL,
 	active_id INTEGER UNIQUE,
 	status TEXT NOT NULL DEFAULT 'backlog',
-	due_date DATE,
-	creation_date DATE DEFAULT (date('now'))
+	creation_date DATE DEFAULT (date('now')),
+	due_date TEXT,
+	    CHECK (
+	        due_date IS NULL OR 
+	        due_date GLOB '????-??-??'
+		)
 );
 
 CREATE TABLE entries(