Merge pull request #281 from plotly/andrew/use_process_group

Andrew/use process group

Author: ayjayt

CHANGELOG.txt

@@ -1,4 +1,4 @@
-v1.3.0
+v1.3.0rc0
 - Change to process group for better killing of multi-process chrome
 - Add argument to Session/Target `send_command(..., *, with_perf: bool)` to
   return timing information about browser write/read.

ROADMAP.md

@@ -1,8 +1,9 @@
 # Roadmap
 
-- [ ] Fix up browser deps error (eliminate in-package analysis)
-- [ ] Switch to process group and kill that to catch all chromium children
-- [ ] Add helpers for running javascript
+- [x] Fix up browser deps error (eliminate in-package analysis)
+- [x] Switch to process group and kill that to catch all chromium children
+- [x] Add helpers for running javascript
+- [ ] Add helper just for refreshing page
 - [ ] Working on better diagnostic information
   - [ ] Explain to user when their system has security restrictions
 - [ ] Eliminate synchronous API: it's unused, hard to maintain, and nearly