Merge pull request #193 from Eijebong/you-spin-me-right-round-baby-right-round

Update spin to 0.9

Author: KodrAus

Cargo.toml

@@ -15,7 +15,9 @@ categories = [ "no-std", "rust-patterns", "memory-management" ]
 exclude = ["/.travis.yml", "/appveyor.yml"]
 
 [dependencies.spin]
-version = "0.7.0"
+version = "0.9.2"
+default-features = false
+features = ["once"]
 optional = true
 
 [features]