ignore this with warning

[todo]

servoarray/src/lib/servoarray.cpp

Lines 34 to 39 in 983a01f

	// TODO: ignore this with warning
	throw std::runtime_error("Offset index out of range");
	}
	this->offsets_[p.first] = p.second;
	}

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This issue was generated by todo based on a TODO comment in 983a01f when #26 was merged. cc @MonoMotion.