Add v2.1.0 CHANGELOG

CHANGES.md

@@ -1,3 +1,18 @@
+## 2.1.0 (2020-05-12)
+
+### Fixed
+
+- Fix `execute_pipe`'s exception handling. Previously, exceptions could cause the pipe to close and appear to finish
+  successfully. Now, the pipe will be left open and an exception will be thrown.
+- Correctly parser SQL queries containing single quotes in comments. Previously, a $ parameter surrounded by
+  comments containing quotes could fail to be replaced and would be treated as a literal currency value.
+- Fix hang if `execute_map`'s `~f` throws an exception. This caused caused by `f` being executed in a different
+  Async context, so the exception wouldn't be caught by the correct context.
+- Ensure result sets can't be skipped when using `execute_pipe`. This makes us finish reading the previous result
+  set before continuing to the next one.
+- Cancel query results immediately after an exception instead of waiting for the next query. This can prevent
+  holding onto resources for an excessive amount of time.
+
 ## 2.0.3 (2020-05-08)
 
 ### Fixed