Teensy++ 2.0 can truly go away

platformio.ini

 monitor_speed = 250000
 
 #
-# Teensy++ 2.0
-#
-[env:teensy20]
-platform          = teensy
-framework         = arduino
-board             = teensy20pp
-build_flags       = ${common.build_flags}
-#board_build.f_cpu = 20000000L     ; Bug in Arduino framework disallows boards running at 20Mhz
-lib_deps          = ${common.lib_deps}
-lib_ldf_mode      = deep+
-src_filter        = ${common.default_src_filter}
-monitor_speed     = 250000
-
-#
 # Teensy 3.5 / 3.6 (ARM Cortex-M4)
 #
 [env:teensy35]