Update mbed-os.lib to release 5.15.1 (#208)

rajkan01 · web-flow · commit b92624b31c3c · 2020-03-24T11:30:07.000Z
diff --git a/mbed-os.lib b/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#64853b354fa188bfe8dbd51e78771213c7ed37f7
+https://github.com/ARMmbed/mbed-os/#e642a7d8b3609a7c903e042cd772f00a5d299088

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-https://github.com/ARMmbed/mbed-os/#64853b354fa188bfe8dbd51e78771213c7ed37f7`
	`1`	`+https://github.com/ARMmbed/mbed-os/#e642a7d8b3609a7c903e042cd772f00a5d299088`