Do not disable SSL verifications by default

arkindex/client.py

@@ -10,12 +10,12 @@ class ArkindexAPI(object):
 
     DEFAULT_BASE_URL = 'https://arkindex.teklia.com/api/v1/'
 
-    def __init__(self, token=None, base_url=DEFAULT_BASE_URL, verify_ssl=None):
+    def __init__(self, token=None, base_url=DEFAULT_BASE_URL, verify_ssl=True):
         self.auth = ArkindexTokenAuth(token) if token else None
         self.base_url = str(base_url)
         if not self.base_url.endswith('/'):
             self.base_url += '/'
-        if verify_ssl:
+        if isinstance(verify_ssl, str):
             assert os.path.exists(verify_ssl)
         self.verify_ssl = verify_ssl