Update mbed-os version to 5.15

michalpasztamobica · michalpasztamobica · commit ccf2f4862cce · 2019-12-19T14:12:37.000+02:00
diff --git a/mbed-os.lib b/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#51d55508e8400b60af467005646c4e2164738d48
+https://github.com/ARMmbed/mbed-os/#64853b354fa188bfe8dbd51e78771213c7ed37f7

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-https://github.com/ARMmbed/mbed-os/#51d55508e8400b60af467005646c4e2164738d48`
	`1`	`+https://github.com/ARMmbed/mbed-os/#64853b354fa188bfe8dbd51e78771213c7ed37f7`