DOC: updated aacgmv2 testing standards
DOC: updated aacgmv2 testing standards

AACGMV2 now meets the pyHC testing standards, updated badge to reflect this.
heliophysicsPy/heliophysicsPy.github.io,heliophysicsPy/heliophysicsPy.github.io,heliophysicsPy/heliophysicsPy.github.io