Document to use stage2

Evidently there's some difference, see #144 (comment)
avr-rust · Jun 13, 2019 · 8405b30 · 8405b30
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commit 8405b30
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -57,7 +57,7 @@ make
 make install
 
 # Register the toolchain with rustup
-rustup toolchain link avr-toolchain $(realpath $(find . -name 'stage1'))
+rustup toolchain link avr-toolchain $(realpath $(find . -name 'stage2'))
 
 # Optionally enable the avr toolchain globally
 rustup default avr-toolchain