CHANGELOG.md in rand_sum-0.2.0 vs CHANGELOG.md in rand_sum-0.2.1

@@ -1,8 +1,13 @@
 # CHANGELOG
 
+## v0.2.0 (2021-01-15)
+
+- return self if array size is zero or one
+
 ## v0.2.0 (2021-01-14)
 
 - add CHANGELOG.md
 - remove .DS\_Store
 - change developer e-mail address
 - move tests from rspec to minitest
+- test with ruby 3.0.0