fix(babe7): file.parserOpts is moved to file.opts.parserOpts since Babel7-beta.3

Author: twada

lib/babel-assertion-visitor.js

@@ -163,7 +163,7 @@ BabelAssertionVisitor.prototype.parseCanonicalCode = function (file, code) {
 
     function doParse(wrapper) {
         var content = wrapper ? wrapper(code) : code;
-        var output = babylon.parse(content, assign({}, file.parserOpts, {tokens: true}));
+        var output = babylon.parse(content, assign({}, file.opts.parserOpts, {tokens: true}));
         if (wrapper) {
             ast = output.program.body[0].body;
             tokens = output.tokens.slice(6, -2);