build: remove unused anyhow dependency

src/machoke/BUILD

@@ -4,7 +4,6 @@ rust_library(
     name = "machoke_lib",
     crate_name = "machoke",
     srcs = ["lib.rs"],
-    deps = ["//third_party/crates:anyhow"],
 )
 
 rust_binary(

src/machoke/Cargo.toml

@@ -11,4 +11,3 @@ name = "machoke"
 path = "main.rs"
 
 [dependencies]
-anyhow = "1"

src/machoke/lib.rs

@@ -1,5 +1,3 @@
-use anyhow::Result;
-
-pub fn greeting() -> Result<&'static str> {
-    Ok("Hello from machoke")
+pub fn greeting() -> &'static str {
+    "Hello from machoke"
 }

src/machoke/main.rs

@@ -1,6 +1,3 @@
 fn main() {
-    println!(
-        "{}",
-        machoke::greeting().expect("greeting should be available")
-    );
+    println!("{}", machoke::greeting());
 }