Move rematch2 to Suggests

DESCRIPTION

@@ -37,7 +37,6 @@ Imports:
     knitr,
     miniUI,
     purrr,
-    rematch2,
     rlang,
     rmarkdown,
     rstudioapi,
@@ -47,7 +46,8 @@ Imports:
     tidyr,
     utils
 Suggests: 
-    testthat
+    testthat,
+    rematch2
 Encoding: UTF-8
 LazyData: true
 Roxygen: list(markdown = TRUE)