fix some yaml syntax problems on source files

src/001_wishlist.yaml

@@ -1,3 +1,4 @@
+---
 title: "Wishlist"
 prefix: "W"
 sections:
@@ -34,7 +35,7 @@ sections:
   - title: "Not Yet Owned"
     games:
       - name: "Parasite Eve"
-        platform: PS1
+        platform: "PS1"
       - name: "Tunic"
         platform: "PC"
       - name: "Nine Sols"

src/002_todo.yaml

@@ -1,3 +1,4 @@
+---
 title: "List of Shame"
 prefix: "S"
 sections:
@@ -74,7 +75,7 @@ sections:
       - name: "Final Fantasy IX"
         platform: "PC"
       - name: "Final Fantasy XIII"
-        platform: PS3
+        platform: "PS3"
       - name: "Lightning Returns: Final Fantasy XIII"
         platform: "PC"
       - name: "Bastion"

src/003_finished.yaml

@@ -1,3 +1,4 @@
+---
 title: "List of Pride"
 prefix: "P"
 sections: