Make functions exported

src/snake_case.nim

@@ -1,6 +1,6 @@
 ## Convert strings to/from SNAKE_CASE
 
-proc toSnakeCase(str: string): string =
+proc toSnakeCase*(str: string): string =
   ## Convert a camelCase string to SNAKE_CASE
   if str.len > 0:
     var prv: char = '\0'
@@ -17,7 +17,7 @@ proc toSnakeCase(str: string): string =
         if result.len > 0 and result[^1] != '_':
           result.add '_'
 
-proc fromSnakeCase(str: string): string =
+proc fromSnakeCase*(str: string): string =
   ## Convert from SNAKE_CASE to camelCase
   var usc: bool = false
   for ch in str: