Update charted to 0.4.8 and roll

packages/quiver_iterables/CONTRIBUTING.md

Index: packages/quiver_iterables/CONTRIBUTING.md
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-# How to contribute
-
-### Sign our Contributor License Agreement (CLA)
-
-Even for small changes, we ask that you please sign the CLA electronically
-[here](https://developers.google.com/open-source/cla/individual).
-The CLA is necessary because you own the copyright to your changes, even
-after your contribution becomes part of our codebase, so we need your permission
-to use and distribute your code. You can find more details
-[here](https://code.google.com/p/dart/wiki/Contributing). You'll only need to
-do this once.
-
-### Contribution Guidelines
-
-We welcome your pull requests, issue reports and enhancement requests. To make
-the process as smooth as possible, we request the following:
-
-   * Sign the [CLA](https://cla.developers.google.com/about/google-individual)
-     (see above) before sending your pull request. It's quick, we promise!
-   * Have test cases for your changes and ensure that the existing ones pass in
-     checked mode.
-   * Run your changes through `dartfmt`. Follow the installation instructions
-     in the [dart_style](https://github.com/dart-lang/dart_style) README for
-     more info.
-   * Squash your commits into a single commit with a good description. You can
-     use `git rebase -i` for this. For more details on rebasing, check out
-     Atlassian's
-     [tutorial](https://www.atlassian.com/git/tutorials/rewriting-history).
-   * During code review, go ahead and pile up commits addressing review
-     comments. Once you get an LGTM (looks good to me) on the review, we'll ask
-     you to squash your commits one last time, then we'll be good to merge!