readme: make list of links even tighter.
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		| @@ -53,13 +53,11 @@ Spack is an open source project.  Questions, discussion, and | |||||||
| contributions are welcome. Contributions can be anything from new | contributions are welcome. Contributions can be anything from new | ||||||
| packages to bugfixes, documentation, or even new core features. | packages to bugfixes, documentation, or even new core features. | ||||||
|  |  | ||||||
| **Resources:** | Resources: | ||||||
|  |  | ||||||
| * **Slack workspace**: [spackpm.slack.com](https://spackpm.slack.com). | * **Slack workspace**: [spackpm.slack.com](https://spackpm.slack.com). | ||||||
|   Open to anyone; visit |   To get an invitation, [**click here**](https://spackpm.herokuapp.com). | ||||||
|   [spackpm.herokuapp.com](https://spackpm.herokuapp.com) to have an | * **Mailing list**: [groups.google.com/d/forum/spack](https://groups.google.com/d/forum/spack) | ||||||
|   invitation emailed to you automatically. |  | ||||||
| * **Mailing list**: https://groups.google.com/d/forum/spack |  | ||||||
| * **Twitter**: [@spackpm](https://twitter.com/spackpm). Be sure to | * **Twitter**: [@spackpm](https://twitter.com/spackpm). Be sure to | ||||||
|   `@mention` us! |   `@mention` us! | ||||||
|  |  | ||||||
|   | |||||||
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	 Todd Gamblin
					Todd Gamblin