updates travis, code formatting and readme

[buildbot-princeton]

The files changed require a buildbot test. Buildbot has started.

[buildbot-princeton]

Your changes passed the buildbot test. See build 944.

[codecov-commenter]

Codecov Report

Patch coverage: 33.33% and no project coverage change.

Comparison is base (31a650a) 50.32% compared to head (1ec5d5d) 50.32%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #1590 +/- ## ======================================= Coverage 50.32% 50.32% ======================================= Files 250 250 Lines 56337 56337 ======================================= Hits 28352 28352 Misses 27985 27985 ``` | [Impacted Files](https://codecov.io/gh/SPECFEM/specfem3d/pull/1590?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM) | Coverage Δ | | |---|---|---| | [...rse\_problem\_for\_model/elastic\_tensor\_tools\_mod.f90](https://codecov.io/gh/SPECFEM/specfem3d/pull/1590?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL2ludmVyc2VfcHJvYmxlbV9mb3JfbW9kZWwvZWxhc3RpY190ZW5zb3JfdG9vbHNfbW9kLmY5MA==) | `0.00% <ø> (ø)` | | | [...inverse\_problem\_for\_model/inverse\_problem\_main.f90](https://codecov.io/gh/SPECFEM/specfem3d/pull/1590?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL2ludmVyc2VfcHJvYmxlbV9mb3JfbW9kZWwvaW52ZXJzZV9wcm9ibGVtX21haW4uZjkw) | `100.00% <ø> (ø)` | | | [...problem\_for\_model/parallel\_for\_inverse\_problem.f90](https://codecov.io/gh/SPECFEM/specfem3d/pull/1590?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL2ludmVyc2VfcHJvYmxlbV9mb3JfbW9kZWwvcGFyYWxsZWxfZm9yX2ludmVyc2VfcHJvYmxlbS5mOTA=) | `26.66% <29.41%> (ø)` | | | [.../inverse\_problem\_for\_model/inverse\_problem\_par.f90](https://codecov.io/gh/SPECFEM/specfem3d/pull/1590?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM#diff-c3JjL2ludmVyc2VfcHJvYmxlbV9mb3JfbW9kZWwvaW52ZXJzZV9wcm9ibGVtX3Bhci5mOTA=) | `75.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SPECFEM)

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[danielpeter]

accept

On 12 Mar 2023, at 5:54 PM, buildbot-princeton @.**@.>> wrote:

Your changes passed the buildbot test. See build 944https://urldefense.com/v3/__http://specfem3d-buildbot.princeton.edu/builders/specfem3d_builder/builds/944__;!!Nmw4Hv0!24tZ3_-wpgMtUXIT-QCYpc4QJRpq4qfufhx6aT-cqvgJMsRHPVnHfaUWpRwGgOsiYQnuBt7qupa5vxZI5uu92TJGvPA4bPE$.

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