updates submodules and travis fix; updates contributions

.travis.yml

@@ -17,6 +17,10 @@ compiler: gcc
 # deprecated
 #sudo: required
 
+# turns off submodule fetching by default
+git:
+  submodules: false
+
 env:
   global:
     - FC=gfortran

README.md

@@ -59,6 +59,11 @@ involved in the community and keep them in the specfem3d github wiki:
 [specfem3d wiki](https://github.com/SPECFEM/specfem3d/wiki)
 
 
+## Our contributors :sparkles:
+
+[![SPECFEM3D contributors](https://contrib.rocks/image?repo=SPECFEM/specfem3d)](https://github.com/SPECFEM/specfem3d/graphs/contributors)
+
+
 ## Computational Infrastructure for Geodynamics (CIG)
 
 SPECFEM3D is part of the software that is hosted by the Computational Infrastructure for Geodynamics (CIG). It is available on the CIG website [here (SPECFEM3D)](https://geodynamics.org/resources/specfem3dcartesian).

doc/USER_MANUAL/authors.tex

@@ -73,6 +73,7 @@ \section*{Authors}
 Elliott Sales de Andrade,
 Brian Savage,
 Bernhard Schuberth,
+Eyal Shimony,
 Anne Sieminski,
 James Smith,
 Leif Strand,