fix the last few that rerast missed

Author: jyn514

src/db/file.rs

@@ -26,7 +26,7 @@ fn get_file_list_from_dir<P: AsRef<Path>>(path: P,
                                           -> Result<()> {
     let path = path.as_ref();
 
-    for file in try!(path.read_dir()) {
+    for file in path.read_dir()? {
         let file = file?;
 
         if file.file_type()?.is_file() {

src/docbuilder/crates.rs

@@ -66,7 +66,7 @@ pub fn crates_from_path<F>(path: &PathBuf, func: &mut F) -> Result<()>
         return Err(err_msg("Not a directory"));
     }
 
-    for file in try!(path.read_dir()) {
+    for file in path.read_dir()? {
         let file = file?;
         let path = file.path();
         // skip files under .git and config.json

src/utils/copy.rs

@@ -55,7 +55,7 @@ fn copy_files_and_handle_html(source: PathBuf,
         r"(\.lock|\.txt|\.woff|\.svg|\.css|main-.*\.css|main-.*\.js|normalize-.*\.js|rustdoc-.*\.css|storage-.*\.js|theme-.*\.js)$")
         .unwrap();
 
-    for file in try!(source.read_dir()) {
+    for file in source.read_dir()? {
 
         let file = file?;
         let mut destination_full_path = PathBuf::from(&destination);