Update minimum CMake version in README The minimum got bumped in the LLVM upgrade of #34743.
@ -19,7 +19,7 @@ Read ["Installing Rust"] from [The Book].
* `g++` 4.7 or later or `clang++` 3.x
* `python` 2.7 (but not 3.x)
* GNU `make` 3.81 or later
* `cmake` 2.8.8 or later
* `cmake` 3.4.3 or later
* `curl`
* `git`
The note is not visible to the blocked user.