senml: Allow publishing to PyPI as micropython-senml.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

micropython/senml/manifest.py

@@ -1,4 +1,8 @@
-metadata(version="0.1.0")
+metadata(
+    description="SenML serialisation for MicroPython.",
+    version="0.1.0",
+    pypi_publish="micropython-senml",
+)
 
 require("cbor2")