docs: add rtd status to readme

README.rst

@@ -1,7 +1,7 @@
 |Shape-Out|
 ===========
 
-|PyPI Version| |Build Status Linux| |Build Status Win| |Coverage Status|
+|PyPI Version| |Build Status Linux| |Build Status Win| |Coverage Status| |Docs Status|
 
 
 Shape-Out is a graphical user interface for the analysis
@@ -55,3 +55,5 @@ of Shape-Out can be found at https://github.com/ZELLMECHANIK-DRESDEN/ShapeOut/tr
    :target: https://ci.appveyor.com/project/paulmueller/ShapeOut
 .. |Coverage Status| image:: https://img.shields.io/codecov/c/github/ZELLMECHANIK-DRESDEN/ShapeOut/master.svg
    :target: https://codecov.io/gh/ZELLMECHANIK-DRESDEN/ShapeOut
+.. |Docs Status| image:: https://readthedocs.org/projects/shapeout/badge/?version=develop
+   :target: https://readthedocs.org/projects/shapeout/builds/

shapeout/lin_mix_mod.py

@@ -460,7 +460,7 @@ def linmixmod(xs, treatment, timeunit, model='lmm', RCMD=cran.rcmd):
         timeunit = np.concatenate(timeunit)
 
     # Open a pyper instance
-    r1 = pyper.R(RCMD=RCMD, use_pandas=True)
+    r1 = pyper.R(RCMD=RCMD)
     # try to fix unicode decode errors by forcing english
     r1('Sys.setenv(LANG = "en")')
     r1.assign("xs", xs)