Merge branch 'f-logger-warning' into 'dev'

FIX: logger warning

See merge request caosdb/caosdb-pylib!24

.gitlab/merge_request_templates/General.md

+Insert a meaningful description for this merge request here.  What is the
+new/changed behavior?  Which bug was fixed?
+
+---
+
+Add the text above this line to the git comment.
+
+# Check list for the author #
+
+- [ ] All tests pass. (style, unit/integration, static code analysis)
+- [ ] What is the main focus for the reviewer?  What is the core intent of this
+      MR?
+- [ ] How to set up a test environment.
+- [ ] Annotations in code (Gitlab comments)
+  - Intent of new code
+  - Problems with old code
+  - Why this implementation?
+
+# Check list for the reviewer #
+
+- [ ] Tests pass
+- [ ] Do I understand the intent of this MR?
+- [ ] Does the test environment setup work?
+- [ ] Is the intended behavior reproducible in the test environment?
+- [ ] Code overview: Which functions/classes are relevant for understanding the MR?
+- [ ] Work through the open comment threads.
+- [ ] Are the doc strings / comments up-to-date?  Or have there been behavioral
+  changes without amending the documentation?
+- [ ] Are there spezifications? Are they satisfied?

CHANGELOG.md

@@ -22,6 +22,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed ###
 
+- Replaced deprecated Logger.warn() method.
+
 ### Security ###
 
 ## [0.3.0] - 2020-04-24##

src/caosdb/connection/connection.py

@@ -178,10 +178,10 @@ class _DefaultCaosDBServerConnection(CaosDBServerConnection):
         context.verify_mode = ssl.CERT_REQUIRED
 
         if config.get("ssl_insecure"):
-            _LOGGER.warn("*** Warning! ***\n"
-                         "Insecure SSL mode, certificate will not be checked! "
-                         "Please consider removing the `ssl_insecure` configuration option.\n"
-                         "****************")
+            _LOGGER.warning("*** Warning! ***\n"
+                            "Insecure SSL mode, certificate will not be checked! "
+                            "Please consider removing the `ssl_insecure` configuration option.\n"
+                            "****************")
             context.verify_mode = ssl.CERT_NONE
 
         if (not context.verify_mode == ssl.CERT_NONE and