Add CRAN comments

cran-comments.md

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+## R CMD check results
+
+0 errors | 0 warnings | 1 note
+
+I'm so sorry to be re-submitting this so soon after my previous submission.
+That version (1.4.0) has started causing problems for deployed projects
+that use packages that link to {later}, like {httpuv} and {promises},
+because their CRAN binaries are built against the latest CRAN {later} but
+they may have pinned their locally installed {later} to an older version.
+This causes R_GetCCallable calls in those dependent packages to fail on
+package startup.
+
+This submission is intended to fix this problem by gracefully detecting the
+version mismatch, and simply not performing R_GetCCallable calls that will
+not succeed.
+
+More details here:
+https://github.com/r-lib/later/issues/203