clean up dependencies

The `paste` dependency is no longer used after `syn` migration. The
`prettyplease` is already a dependency via `trybuilld`; the explicit
dependency was used to enable the `verbatim` feature when it does not
support `&raw` expressions. It is supported natively by `prettyplease` now
so the feature (and the explicit dependency) was no longer needed.

Signed-off-by: Gary Guo <gary@garyguo.net>

Author: nbdd0121

Cargo.lock

@@ -17,7 +17,6 @@ keywords = ["safe", "pin", "init", "no-std", "rust-patterns"]
 categories = ["no-std", "rust-patterns", "embedded"]
 
 [dependencies]
-paste = "1.0"
 pin-init-internal = { path = "./internal", version = "=0.0.6" }
 
 [features]
@@ -33,8 +32,6 @@ rustc_version = "0.4"
 libc = "0.2"
 trybuild = { version = "1.0", features = ["diff"] }
 macrotest = "1.0"
-# needed for macrotest, have to enable verbatim feature to be able to format `&raw` expressions.
-prettyplease = { version = "0.2.37", features = ["verbatim"] }
 
 [lints.rust]
 stable_features = "allow"