ClangComplexityBear: Fix AttributeError
ClangComplexityBear: Fix AttributeError

This fixes AttributeError by replacing previously removed
function of `SourceRange` with `sourcerange_from_clang_range`
function.

Fixes https://github.com/coala/coala-bears/issues/2570

coala/coala-bears,refeed/coala-bears,coala/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,coala-analyzer/coala-bears,coala-analyzer/coala-bears,refeed/coala-bears,refeed/coala-bears,coala/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,coala/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,refeed/coala-bears,coala/coala-bears,coala/coala-bears,refeed/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,coala/coala-bears,refeed/coala-bears,coala-analyzer/coala-bears,coala/coala-bears,refeed/coala-bears