Log Message:
(math/R-rstudioapi) Updated 0.11 to 0.13

# rstudioapi 0.13

* Fixed an issue where `rstudioapi::insertText()` would fail. (#208)

# rstudioapi 0.12

* Fixed an issue where remote `rstudioapi` calls would erroneously use
  a previous response in some cases.

* Allow `navigateToFile` to accept an empty file. This file will
  default to the file currently in view in the active column.

* Added `registerChunkExecCallback` and `unregisterChunkExecCallback`,
  used to execute a callback after a chunk is ran.