modify default suffix for clear text cassettes

It's better not to add a suffix by default, so that editors can still
recognize file extensions like '.yaml'.

.gitignore

@@ -9,3 +9,4 @@ coverage
 .coveralls.yml
 .secrets
 dist
+.idea

README.md

@@ -66,6 +66,9 @@ class MyEncryptedPersister(BaseEncryptedPersister):
 The encrypted persister can now be registered and used:
 
 ```python
+import vcr
+import requests
+
 # create a custom vcr object
 my_vcr = vcr.VCR()
 
@@ -83,27 +86,26 @@ reserving the one with the encrypted persister only for requests resulting in ca
 
 ## Customization
 
-Sometimes it can be handy to inspect the content of a cassette. This can be done even for encrypted cassettes:
+Sometimes it can be handy to inspect the content of a cassette. This can be done even when using encrypted cassettes:
 
 ```python
 class MyEncryptedPersister(BaseEncryptedPersister):
     encryption_key: bytes = key
     should_output_clear_text_as_well = True
 ```
 
-The persister will output a clear text cassette side by side with the encrypted one. The clear text cassette will
-be saved with a specific file extension (`.clear_text` by default): this will allow to blacklist the extension
-within the version control system to make sure not to share those files. For example for git:
+This persister will output a clear text cassette side by side with the encrypted one. Remember to blacklist all clear
+text cassette in the version control system! For example this will cause git to ignore all `.yaml` file inside a
+cassettes' folder (at any depth):
 
 ```bash
 # file: .gitignore
-*.clear_text
+**/cassettes/**/*.yaml
 ```
-
 Clear text cassettes are only useful for human inspection: the persister will still use only the encrypted ones to
 replay network requests.
 
-If different cassette file extensions are desired, they can be customized:
+If different cassettes file name suffix are desired, they can be customized:
 
 ```python
 class MyEncryptedPersister(BaseEncryptedPersister):

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "vcrpy-encrypt"
-version = "0.9.0"
+version = "0.9.1"
 description = "Encrypt vcrpy cassettes so they can be safely kept under version control."
 
 license = "GPL-3.0-only"

vcrpy_encrypt/persister.py

@@ -29,7 +29,7 @@ class BaseEncryptedPersister(ABC):
 
     encryption_key: Union[None, bytes] = None
     should_output_clear_text_as_well: bool = False
-    clear_text_suffix: str = ".clear_text"
+    clear_text_suffix: str = ""
     encoded_suffix: str = ".enc"
 
     @classmethod