Fix typos in changelog

update_available_ios/CHANGELOG.md

@@ -12,14 +12,14 @@
 - *Null-safety* bump to stable
 - Dependencies versions bump
 
-**Disclaimer:** I think that it's correctly working, but as I am not using *null-safety* in production yet, I couldn't propertly test it. **@ashishbeck** [thinks it's OK to be published as *stable*](https://github.com/mateusfccp/update_available/issues/5#issuecomment-797945264), so I am doing it. If you find any issue, please report.
+**Disclaimer:** I think that it's correctly working, but as I am not using *null-safety* in production yet, I couldn't properly test it. **@ashishbeck** [thinks it's OK to be published as *stable*](https://github.com/mateusfccp/update_available/issues/5#issuecomment-797945264), so I am doing it. If you find any issue, please report.
 
 ## 2.0.0-nullsafety
 
 - Migration to *null-safety*
 - Changed `version` to `pub_semver`
 
-**Disclaimer:** I think that it's correctly working, but as I am not using *null-safety* in production yet, I couldn't propertly test it. I am going to ask to someone to test it for me and, as soon it's safe to be used in production, I publish it as stable.
+**Disclaimer:** I think that it's correctly working, but as I am not using *null-safety* in production yet, I couldn't properly test it. I am going to ask to someone to test it for me and, as soon it's safe to be used in production, I publish it as stable.
 
 ## 1.0.1+1d