Remove travis config as R seems to be unmaintained there

See https://travis-ci.community/t/please-update-the-r-version-used-for-r-release-to-r-4-1-0/11886
and the Pull request referenced there, and the message by Gabor which I
found today:

https://travis-ci.community/t/about-the-r-category/748/2

1 files changed, 3 insertions, 2 deletions

diff --git a/README.html b/README.html
index cdd68210..222f254d 100644
--- a/README.html
+++ b/README.html
@@ -361,13 +361,14 @@ pre code {
 
 
 
+<h1 class="title toc-ignore">README</h1>
 
 </div>
 
 
 <div id="mkin" class="section level1">
 <h1>mkin</h1>
-<p><a href="https://cran.r-project.org/package=mkin"><img src="data:image/svg+xml; charset=utf-8;base64,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" /></a> <a href="https://app.travis-ci.com/github/jranke/mkin"><img src="data:image/svg+xml;base64,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" alt="Build Status" /></a> <a href="https://codecov.io/github/jranke/mkin"><img src="data:image/svg+xml;base64,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" alt="codecov" /></a></p>
+<p><a href="https://cran.r-project.org/package=mkin"><img src="data:image/svg+xml; charset=utf-8;base64,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" /></a></p>
 <p>The R package <strong>mkin</strong> provides calculation routines for the analysis of chemical degradation data, including <b>m</b>ulticompartment <b>kin</b>etics as needed for modelling the formation and decline of transformation products, or if several degradation compartments are involved.</p>
 <div id="installation" class="section level2">
 <h2>Installation</h2>
@@ -396,7 +397,7 @@ pre code {
 <li>The usual one-sided t-test for significant difference from zero is nevertheless shown based on estimators for the untransformed parameters.</li>
 <li>Summary and plotting functions. The <code>summary</code> of an <code>mkinfit</code> object is in fact a full report that should give enough information to be able to approximately reproduce the fit with other tools.</li>
 <li>The chi-squared error level as defined in the FOCUS kinetics guidance (see below) is calculated for each observed variable.</li>
-<li>The ‘variance by variable’ error model which is often fitted using Iteratively Reweighted Least Squares (IRLS) should now be specified as <code>error_model = &quot;obs&quot;</code>.</li>
+<li>The ‘variance by variable’ error model which is often fitted using Iteratively Reweighted Least Squares (IRLS) can be specified as <code>error_model = &quot;obs&quot;</code>.</li>
 </ul>
 </div>
 <div id="unique-in-mkin" class="section level3">