Add 4.0.3 entry
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Support grn_proc_get_type()
Avoid a crash when Record#inspct is called on exit

GitHub: fix #18

Reported by Ippei Obayashi. Thanks!!!
test: group weight vector tests for normal type
test: indent
Follow Groonga 4.0.3
Merge pull request #19 from uu59/follow_groonga_4_0_3

Follow Groonga 4.0.3

Patch by uu59. Thanks!!!
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