Fix type and comment of verify parameter (#238)

So that it's clear that people can pass the path to a CA bundle.

hvac/adapters.py

@@ -31,8 +31,9 @@ def __init__(self, base_uri=DEFAULT_BASE_URI, token=None, cert=None, verify=True
         :param cert: Certificates for use in requests sent to the Vault instance. This should be a tuple with the
             certificate and then key.
         :type cert: tuple
-        :param verify: Flag to indicate whether TLS verification should be performed when sending requests to Vault.
-        :type verify: bool
+        :param verify: Either a boolean to indicate whether TLS verification should be performed when sending requests to Vault,
+            or a string pointing at the CA bundle to use for verification. See http://docs.python-requests.org/en/master/user/advanced/#ssl-cert-verification.
+        :type verify: Union[bool,str]
         :param timeout: The timeout value for requests sent to Vault.
         :type timeout: int
         :param proxies: Proxies to use when preforming requests.

hvac/v1/__init__.py

@@ -28,8 +28,9 @@ def __init__(self, url='http://localhost:8200', token=None,
         :param cert: Certificates for use in requests sent to the Vault instance. This should be a tuple with the
             certificate and then key.
         :type cert: tuple
-        :param verify: Flag to indicate whether TLS verification should be performed when sending requests to Vault.
-        :type verify: bool
+        :param verify: Either a boolean to indicate whether TLS verification should be performed when sending requests to Vault,
+            or a string pointing at the CA bundle to use for verification. See http://docs.python-requests.org/en/master/user/advanced/#ssl-cert-verification.
+        :type verify: Union[bool,str]
         :param timeout: The timeout value for requests sent to Vault.
         :type timeout: int
         :param proxies: Proxies to use when preforming requests.