Add hint and change version back to 2.1.0.3 (was 2.1.0.2)

exercises/resistor-color-duo/.meta/hints.md

@@ -0,0 +1,10 @@
+## Hints
+
+You need to implement the function
+
+```haskell
+value :: (Color, Color) -> Int
+```
+
+that only accepts two colors and produces the resistor's numeric value
+component of its resistance.

exercises/resistor-color-duo/README.md

@@ -27,6 +27,18 @@ brown-green should return 15
 brown-green-violet should return 15 too, ignoring the third color.
 
 
+## Hints
+
+You need to implement the function
+
+```haskell
+value :: (Color, Color) -> Int
+```
+
+that only accepts two colors and produces the resistor's numeric value
+component of its resistance.
+
+
 
 ## Getting Started
 

exercises/resistor-color-duo/package.yaml

@@ -1,5 +1,5 @@
 name: resistor-color-duo
-version: 0.1.0.3
+version: 2.1.0.3
 
 dependencies:
   - base