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Add note about persistent connections #82

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Run time

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Job	Run time
source_abi	1m 4s
abi_linux_build (unversioned)	4m 54s
abi_linux_build (4_2_5)	4m 36s
build_windows (unversioned)	18m 12s
abi_linux_build (4_2_6)	4m 41s
build_macos_x86_64 (unversioned)	6m 53s
build_windows (4_2_5)	17m 51s
build_macos_x86_64 (4_2_5)	7m 11s
build_macos_x86_64 (4_2_6)	7m 56s
build_windows (4_2_6)	18m 14s
abi_linux_x86_64_test	34s
macos_x86_64_test	2m 48s
mock_windows	1m 16s
	1h 36m 10s