Trim go paths (#940)

Fixes #937

Author: r-darwish

src/steps/generic.rs

@@ -65,7 +65,8 @@ pub fn run_flutter_upgrade(run_type: RunType) -> Result<()> {
 
 pub fn run_go(run_type: RunType) -> Result<()> {
     let go = utils::require("go")?;
-    let gopath = run_type.execute(&go).args(&["env", "GOPATH"]).check_output()?;
+    let go_output = run_type.execute(&go).args(&["env", "GOPATH"]).check_output()?;
+    let gopath = go_output.trim();
 
     let go_global_update = utils::require("go-global-update")
         .unwrap_or_else(|_| PathBuf::from(gopath).join("bin/go-global-update"))