Use new Racer from crates.io

Author: Xanewok

Cargo.lock

@@ -43,7 +43,7 @@ lsp-types = { version = "0.60", features = ["proposed"] }
 lazy_static = "1"
 log = "0.4"
 num_cpus = "1"
-racer = { git = "https://github.com/racer-rust/racer", rev = "cbca5c66b6607a340c36fcf4d5fd2166ae41e79d", default-features = false }
+racer = { version = "2.2", default-features = false }
 rand = "0.8"
 rayon = "1"
 rustc_tools_util = "0.2"