Require SWIG 3.0.5 or later

wrappers/python/CMakeLists.txt

@@ -108,17 +108,10 @@ else(SWIG_EXECUTABLE)
     set(SWIG_VERSION "0.0.0" CACHE STRING "Swig version" FORCE)
 endif(SWIG_EXECUTABLE)
 # Enforce swig version
-if (PYTHON_VERSION_MAJOR EQUAL 3)
-    string(COMPARE LESS "${SWIG_VERSION}" "2.0.4" SWIG_VERSION_ERROR)
-    if(SWIG_VERSION_ERROR)
-        message("Swig version must be 2.0.4 or greater for Python 3! (You have ${SWIG_VERSION})")
-    endif(SWIG_VERSION_ERROR)
-else(PYTHON_VERSION_MAJOR EQUAL 3)
-    string(COMPARE LESS "${SWIG_VERSION}" "1.3.39" SWIG_VERSION_ERROR)
-    if(SWIG_VERSION_ERROR)
-        message("Swig version must be 1.3.39 or greater for Python 2! (You have ${SWIG_VERSION})")
-    endif(SWIG_VERSION_ERROR)
-endif(PYTHON_VERSION_MAJOR EQUAL 3)
+string(COMPARE LESS "${SWIG_VERSION}" "3.0.5" SWIG_VERSION_ERROR)
+if(SWIG_VERSION_ERROR)
+    message("Swig version must be 3.0.5 or greater! (You have ${SWIG_VERSION})")
+endif(SWIG_VERSION_ERROR)
 
 find_package(Doxygen REQUIRED)
 mark_as_advanced(CLEAR DOXYGEN_EXECUTABLE)