Provide ES5 browser build for pretty-format

[pedrottimark]

Do you want to request a feature or report a bug?

Report an unintended regression.

What is the current behavior?

pretty-format lacks build-es5 subdirectory after the excellent improvement in #3532

See https://github.com/facebook/jest/pull/3532/files#diff-9b3b0a5fd27925d64d045cf1394e5143L11

What is the expected behavior?

There are enough dependents on pretty-format and its code goes to enough effort so an ES5 build is possible, that we will probably be sorry to publish the next version without it.

@skovhus In case there is more to consider beyond the browser property in package.json would you be willing to look at this?

@cpojer I guess this implies pretty-format never had a smoke test for the build-es5 subdirectory. Is it worth the effort to test it with the subset of ES5 values?

[skovhus]

Should be fairly simple to add, just descoped it in #3532.

Can be solved by:

• add browser field in package.json for pretty-format
• add it to pretty-format to the Karma browser tests I added to ensure it works

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