update NEWS for 2.2.21

swirldev · Jan 4, 2015 · 626b4cf · 626b4cf
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+# swirl 2.2.21
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+* Add `mirror` argument to `install_from_swirl()` to accommodate installing courses from the Bitbucket mirror of our swirl-courses GitHub repository. (Prompted by India's blocking of GitHub.)
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+* Check for existence of variable in swirl.R to address issue with using `rm()` command.
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 # swirl 2.2.20
 
 * Fix troublesome bug in `omnitest` due to typo (thanks to @reginaastri).