refactor!: formatter config functions take self as first argument (#233)

This is a breaking API change, but there is a shim in place that will keep existing functions working, just with a warning notification. Most people should not encounter this at all. For anyone overriding a formatter config value with a function that takes `(ctx)` as the parameter, it will need to be updated to take `(self, ctx)`.

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 60be045..44e6c34 100644
--- a/README.md
+++ b/README.md
@@ -337,7 +337,7 @@ require("conform").formatters.shfmt = {
 }
 -- prepend_args can be a function, just like args
 require("conform").formatters.shfmt = {
-  prepend_args = function(ctx)
+  prepend_args = function(self, ctx)
     return { "-i", "2" }
   end,
 }