chore(deps): Update dependency sphinx_rtd_theme to v1.1.1

Author: renovate[bot]

setup.py

@@ -10,7 +10,7 @@
     license='MIT',
 
     packages=['sponge_docs_theme'],
-    install_requires=['sphinx_rtd_theme==1.0.0'],
+    install_requires=['sphinx_rtd_theme==1.1.1'],
 
     message_extractors={
         'src/theme/js': [