fixes api docs

Author: ringabout

src/prologue/core/contenttype.nim

@@ -22,6 +22,7 @@ proc parseContentType*(headerValue: string): MediaType =
   ## Parses a Content-Type header according to RFC 7230, RFC 2045, and RFC 2046.
   ## Returns a MediaType object containing the main type, sub type, and parameters.
   runnableExamples:
+    import std/tables
     let mediaType = parseContentType("text/plain; charset=\"utf-8\"")
     doAssert mediaType.mainType == "text"
     doAssert mediaType.subType == "plain"