chore: line breaks + add todo item

README.md

@@ -8,7 +8,7 @@ The functions that take `level` as input can take an integer between 1 and 4 (wh
 
 ### Virtual Text
 
-`set_diag_level(level)` - Display only messages of this `level`
+`set_diag_level(level)` - Display only messages of this `level` 
 `set_diag_min(level)` - Display only messages with severity >= this `level`
 
 #### Virtual Text Prefix
@@ -24,10 +24,14 @@ Note input is a table with keys, `e`, `w`, `i`, and `h`. Any can be included or
 
 ### Sign Column
 
-`set_sign_level(level)` - Add signs for only this `level`
+`set_sign_level(level)` - Add signs for only this `level` 
 `set_sign_min(level)` - Add signs for diagnostics >= this `level`
 
 ### Underline
 
-`set_underline_level(level)` - Underline only for this `level`
+`set_underline_level(level)` - Underline only for this `level` 
 `set_underline_min(level)` - Underline for >= this `level`
+
+## TODO
+
+Add tests!