allow uuid_format add more tests and update docs

docs/releases.md

@@ -3,9 +3,10 @@
 *  Allow to pass `uuid_format` (allowed 'hex'(default) or 'string') to `UUID` field to change the format in which it's saved.
    By default field is saved in hex format (trimmed to 32 chars (without dashes)), but you can pass 
    format='string' to use 36 (with dashes) instead to adjust to existing db or other libraries.
+   
    Sample:
-   hex value = c616ab438cce49dbbf4380d109251dce
-   string value = c616ab43-8cce-49db-bf43-80d109251dce
+   *  hex value = c616ab438cce49dbbf4380d109251dce
+   *  string value = c616ab43-8cce-49db-bf43-80d109251dce
 
 # 0.5.3
 

ormar/__init__.py

@@ -30,7 +30,7 @@ class UndefinedType:  # pragma no cover
 
 Undefined = UndefinedType()
 
-__version__ = "0.6.0"
+__version__ = "0.5.4"
 __all__ = [
     "Integer",
     "BigInteger",