update readme links (#1399)

* update readme links
* Add relative to READ_ME.md

---------

Co-authored-by: Doresic <domagoj.doresic@gmail.com>

README.md

@@ -25,12 +25,15 @@ pyPESTO features include:
 * Parameter estimation pipeline for systems biology problems specified in
   [SBML](http://sbml.org/) and [PEtab](https://github.com/PEtab-dev/PEtab)
   ([example](https://github.com/ICB-DCM/pyPESTO/blob/master/doc/example/petab_import.ipynb))
+* Parameter estimation with relative (scaled and offset) data as described in
+  [Schmiester et al. (2020)](https://doi.org/10.1093/bioinformatics/btz581).
+  ([example](https://github.com/ICB-DCM/pyPESTO/blob/master/doc/example/relative_data.ipynb))
 * Parameter estimation with ordinal data as described in
   [Schmiester et al. (2020)](https://doi.org/10.1007/s00285-020-01522-w) and
   [Schmiester et al. (2021)](https://doi.org/10.1093/bioinformatics/btab512).
-  ([example](https://github.com/ICB-DCM/pyPESTO/blob/master/doc/example/ordinal.ipynb))
-* Parameter estimation with censored data. ([example](https://github.com/ICB-DCM/pyPESTO/blob/master/doc/example/censored.ipynb))
-* Parameter estimation with nonlinear-monotone data. ([example](https://github.com/ICB-DCM/pyPESTO/blob/master/doc/example/nonlinear_monotone.ipynb))
+  ([example](https://github.com/ICB-DCM/pyPESTO/blob/master/doc/example/ordinal_data.ipynb))
+* Parameter estimation with censored data. ([example](https://github.com/ICB-DCM/pyPESTO/blob/master/doc/example/censored_data.ipynb))
+* Parameter estimation with nonlinear-monotone data. ([example](https://github.com/ICB-DCM/pyPESTO/blob/master/doc/example/semiquantitative_data.ipynb))
 
 ## Quick install