Add position and size to code_inline

lib/rules_inline/backticks.js

@@ -31,6 +31,8 @@ module.exports = function backtick(state, silent) {
         token.content = state.src.slice(pos, matchStart)
                                  .replace(/[ \n]+/g, ' ')
                                  .trim();
+        token.position = start;
+        token.size = (matchStart + 1) - token.position;
       }
       state.pos = matchEnd;
       return true;