Merge pull request #276 from cyliangtw/master

Add NuMaker-IoT-M467 platform

Author: Patater

src/mbed_os_tools/detect/platform_database.py

@@ -246,6 +246,7 @@
         u"1309": u"NUMAKER_IOT_M252",
         u"1310": u"NUMAKER_IOT_M263A",
         u"1312": u"NU_M2354",
+        u"1313": u"NUMAKER_IOT_M467",
         u"1500": u"RHOMBIO_L476DMW1K",
         u"1549": u"LPC1549",
         u"1600": u"LPC4330_M4",