Apply patch from perillamint on github

use git hash to describe version number

src/build.rs

@@ -6,6 +6,7 @@ fn git_info() {
         if output.status.success() {
             let git_hash = String::from_utf8_lossy(&output.stdout);
             println!("cargo:rustc-env=GIT_HASH={}", git_hash);
+            println!("cargo:rustc-env=GIT_SHORT_HASH={}", &git_hash[..8])
         }
     }
 

src/config.rs

@@ -367,7 +367,7 @@ impl Config {
 
     fn git_version() -> Option<String> {
         let branch = Self::git_branch()?;
-        let hash = Self::git_hash()?;
+        let hash = Self::git_short_hash()?;
 
         Some(format!("{}-{}", branch, hash))
     }
@@ -388,6 +388,10 @@ impl Config {
         option_env!("GIT_HASH")
     }
 
+    fn git_short_hash() -> Option<&'static str> {
+        option_env!("GIT_SHORT_HASH")
+    }
+
     pub(crate) fn user_agent(&self) -> String {
         format!(
             "{} ({}/{}; +{})",