cargo: don't bump dependencies

jordens · japaric · commit 48c0ac0ad0ac · 2019-11-16T19:38:08.000-05:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -16,10 +16,10 @@ heapless = "0.5.0"
 
 [dependencies.serde]
 default-features = false
-version = "1.0.91"
+version = "1.0.80"
 
 [dev-dependencies]
-serde_derive = "1.0.91"
+serde_derive = "1.0.80"
 
 [features]
 std = ["serde/std"]
