Merge pull request #681 from lorenzwalthert/issue-664

- use magrittr 2.0 (#681).

Author: lorenzwalthert

DESCRIPTION

@@ -19,7 +19,7 @@ BugReports: https://github.com/r-lib/styler/issues
 Imports: 
     backports (>= 1.1.0),
     cli (>= 1.1.0),
-    magrittr (>= 1.0.1),
+    magrittr (>= 2.0.0),
     purrr (>= 0.2.3),
     R.cache (>= 0.14.0),
     rematch2 (>= 2.0.1),