Requirements page need update.

Requirements page (http://doc.qt.io/qt3dstudio/requirements.html) needs to be updated.

Current requirements
Tested operating systems for the editor:

• Windows 10
• macOS High Sierra (10.13)
• macOS Sierra (10.12)
• macOS El Capitan (10.11)

Tested operating systems for the runtime (1.0):

• Windows 10 + MSVC 2015
• Windows 7 + mingw32
• macOS Sierra (10.12)
• macOS El Capitan (10.11)
• Android 8.0 (ARMv7)
• QNX 7.0 (x64)
• GHS Integrity

Tested target devices:

• Google Pixel C with Android 8.0
• NVIDIA Jetson TX1 with Boot2Qt
• Intel NUC (NUC6CAY) with Boot2Qt
• NVIDIA drive CX1