Update CRAN comments

Author: DavisVaughan

cran-comments.md

@@ -2,6 +2,17 @@
 
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+## revdepcheck results
+
+We checked 2 reverse dependencies, comparing R CMD check results across CRAN and dev versions of this package.
+
+ * We saw 0 new problems
+ * We failed to check 0 packages
+ 
+## 0.4.0 Submission
+
+This is a minor release containing a few new functions: `date_start()`, `date_end()`, and `invalid_remove()`. It also requires tzdb 0.1.2 to hopefully fix a compilation issue on RHEL7/Centos machines.
+
 ## 0.3.1 Submission
 
 This is a patch release mainly intended to support an upcoming breaking change in testthat.