Update mbed-os.lib in master branch

Qinghao Shi · web-flow · commit e1d509586f8e · 2020-01-19T21:52:29.000Z
In master branch, we don't want to set it to a set to a released SHA file, to keep it empty, os it will pointed to the latest mbed-os
diff --git a/mbed-os.lib b/mbed-os.lib
@@ -1,2 +1 @@
-https://github.com/ARMmbed/mbed-os/#64853b354fa188bfe8dbd51e78771213c7ed37f7
-
+https://github.com/ARMmbed/mbed-os/

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1 @@`
`1`		`-https://github.com/ARMmbed/mbed-os/#64853b354fa188bfe8dbd51e78771213c7ed37f7`
`2`		`-`
	`1`	`+https://github.com/ARMmbed/mbed-os/`