Add .yarnrc to use exact versions (#2016)

Now, `yarn add` and `yarn upgrade` will write exact versions to
package.json and yarn.lock.

See commit fadbbeb (https://github.com/prettier/prettier/pull/291)
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Joseph Frazier authored and Christopher Chedeau committed 2017-06-06 18:04:52 -07:00
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save-prefix ""