Added link to bossa instructions for Feather M0

Added a note in the Feather M0 docs to link to the bossa instructions, since some older Feather M0s are not hf2-compatible and instead should use bossa.
atsamd-rs · Apr 19, 2020 · 011ba2b · 011ba2b
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commit 011ba2b
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diff --git a/boards/feather_m0/README.md b/boards/feather_m0/README.md
@@ -24,3 +24,6 @@ $ cargo hf2 --release --example blinky_basic
     Finished in 0.079s
 $
 ```
+
+Note that some older Feather M0 boards do not come with support for HF2. For these boards,
+you can upload using the `bossa` tool as described in the [atsamd crate documentation](https://github.com/markhildreth/atsamd#getting-code-onto-the-device-gemma-m0).