fix default rows again.
v0.1.3
test: fix window size test after 6d466465
remove unused `std` namespace import

Nothing from `std` is being used, and it was causing llvm to show a warning:

  ../src/pty.cc:61:17: warning: using directive refers to implicitly-defined namespace 'std'
  using namespace std;
                  ^
Merge remote-tracking branch 'vendor/master'