Add more checksums (#371)

- Spark 3.0.1 and 2.4.7
- Zookeeper 3.6.2
diff --git a/conf/checksums b/conf/checksums
index 3c1507d..5ecd9a5 100644
--- a/conf/checksums
+++ b/conf/checksums
@@ -26,7 +26,9 @@
 hadoop:2.7.6:f2327ea93f4bc5a5d7150dee8e0ede196d3a77ff8526a7dd05a48a09aae25669
 hadoop:2.7.5:0bfc4d9b04be919be2fdf36f67fa3b4526cdbd406c512a7a1f5f1b715661f831
 hadoop:2.6.5:001ad18d4b6d0fe542b15ddadba2d092bc97df1c4d2d797381c8d12887691898
+spark:3.0.1:07FC6DF224F303EF53189E6082004400D51CD6C2244D1851D90EABBE58404A69FF980BFFE147A5259A34190E1E1C974C72D02470D10A783D2D87F43A8DA0850B
 spark:3.0.0:E955A22D4AC917883BCE7327711F33829818946EDC40F1316F0B651DD15B243DFC2FB345794634B41ABA75F0BE2C1E4E1850331409B367F101BF2D308F463709
+spark:2.4.7:FF75E6DB3C4CA5CECE2A8A26AD7BD8A2C1C46B4F93E8F2922A31E6A8D98274BEDC66BEF3E469E862D249C5439355CCCA83687A20D536A8400F2C058BE553DF57
 spark:2.4.5:17A8B3BD0151E506E2B3C09FFE6F1010FFE1C6B7B906F3A19D357B37098EBD0C3AD91E6501545AE87834B81D2EF07556E5FECCFB7275D1C74533777BC7A5DF3B
 spark:2.4.4:A3E4FDEAD2409C8D1E0F213145ACC3B43788285715EB100DD29B171E6B24012673DDD94BDC612D946764B71CBC8F78BCD93889A4BC60B3136A33CD7E6C4DBC26
 spark:2.4.3:4db62e110c8080f28ac8f1d701b7477cede23e60b51231ab63687b2cc6150faa
@@ -34,6 +36,7 @@
 spark:2.3.3:a5c4a54db5163df25110534f36e13d6ae65758d45d1bc8bfcd7e27304e716a23
 spark:2.3.2:3387107155d62f04ccf6bcaf2e00a69a0de5ae5df875348d93147743c206f0a8
 spark:2.2.2:023b2fea378b3dd0fee2d5d1de6bfaf2d8349aefe7be97a9cbcf03bbacc428d7
+zookeeper:3.6.2:caff5111bb6876b7124760bc006e6fa2523efa54b99321a3c9cd8192ea0d5596abc7d70a054b1aac9b20a411407dae7611c7aba870c23bff28eb1643ba499199
 zookeeper:3.6.1:1c5cb4d9886fae41bf244a446dd874b73c0fff7a5fc2dda4305041964420cde21e59b388dfd2551464a46bb6918d9d3c3c01ebe68fdbe782074ee360aa830c7d
 zookeeper:3.5.8:9f2c2293a60e02244dff64438704094b2edb167bc45aa82def49eb4a7a3084881057f5d81384926e23a1029f699e6f41bfee5e19fc1664d044ff9c56bcaa6b31
 zookeeper:3.5.7:b9baa1ecb3d4dc0ef648ce7c74da4c5267ee89534c7614b8f27d3b0bc52004dcfbb8cecec810ffb7c8c45053daf8a5e849ce60ba241280fa1e2ab1d3b4990494