Update README.md

Author: antonmedv

README.md

@@ -5,7 +5,7 @@
 
 await $`cat package.json | grep name`
 
-let branch = await $`git branch --show-current`
+const branch = await $`git branch --show-current`
 await $`dep deploy --branch=${branch}`
 
 await Promise.all([
@@ -14,7 +14,7 @@ await Promise.all([
   $`sleep 3; echo 3`,
 ])
 
-let name = 'foo bar'
+const name = 'foo bar'
 await $`mkdir /tmp/${name}`
 ```