Merge pull request #80 from Nemo157/patch-1

Recommend using --locked for build

Author: euclio

README.md

@@ -36,9 +36,9 @@ Here's an example of managing installation with vim-plug:
 function! BuildComposer(info)
   if a:info.status != 'unchanged' || a:info.force
     if has('nvim')
-      !cargo build --release
+      !cargo build --release --locked
     else
-      !cargo build --release --no-default-features --features json-rpc
+      !cargo build --release --locked --no-default-features --features json-rpc
     endif
   endif
 endfunction