README.md in postrank-uri-1.0.18 vs README.md in postrank-uri-1.0.20

@@ -35,6 +35,31 @@
 
 ## C14N
 
 As part of URI canonicalization the library will remove common tracking parameters from Google Analytics and several other providers. Beyond that, host-specific rules are also applied. For example, nytimes.com likes to add a 'partner' query parameter for tracking purposes, but which has no effect on the content - hence, it is removed from the URI. For full list, see the c14n.yml file.
 
-Detecting "duplicate URLs" is a hard problem to solve (expensive in all senses), instead we are compiling a manually assembled database. If you find cases which are missing, please do report them, or send us a pull request!
\ No newline at end of file
+Detecting "duplicate URLs" is a hard problem to solve (expensive in all senses), instead we are compiling a manually assembled database. If you find cases which are missing, please do report them, or send us a pull request!
+
+## Development
+
+### Setup
+
+```
+bundle install
+```
+
+### Running tests
+
+```
+bundle exec rake
+```
+
+### Running dependency appraisals
+
+To verify `postrake-uri` works with different versions of its runtime dependencies you can run:
+
+```
+bundle exec appraisal install
+bundle exec rake appraisal
+```
+
+This will execute the test suite with different versions of the dependencies.