test: fix compatibility examples output rendering

Author: mstream

Examples.generated.md

@@ -14,7 +14,9 @@ When there is not JSON schema differences, schema change is fully compatible.
 no differences
 ```
 #### Output
+```
 full
+```
 
 ---
 ## Diff

test/unit/Main.purs

@@ -15,7 +15,6 @@ import Data.String as String
 import Effect (Effect)
 import Effect.Aff (Aff, launchAff_)
 import Effect.Exception (throw)
-import JsonSchema.Compatibility (Compatibility)
 import Node.Encoding (Encoding(..))
 import Node.FS.Aff as FS
 import Node.Process as Process

test/unit/Test/Spec/JsonSchema/Compatibility.purs

@@ -34,7 +34,10 @@ renderInput differences =
       differences
 
 renderOutput ∷ Compatibility → String
-renderOutput = Compatibility.renderCompatibility
+renderOutput compatibility =
+  "```\n"
+    <> Compatibility.renderCompatibility compatibility
+    <> "\n```"
 
 transform ∷ Set Difference → Compatibility
 transform = Compatibility.calculate