Proposed solution to lab 3

Revision:
3:f5d7fddeef39
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed_app.json	Thu Jan 31 11:10:30 2019 +0000
@@ -0,0 +1,7 @@
+{
+    "config": {
+        "main-stack-size": {
+            "value": 2000
+        }
+    }
+}
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