Protect dependent repository master branch

[doitian]

Protect the master branch of the following repositories. Force pushes on these repositories break the build of the old version of CKB.

network/Cargo.toml
29:r2d2_sqlite = {git = "https://github.com/jjyr/r2d2-sqlite", rev="8ade92077977c4860562b1337b95ec8ed2000711"}

shared/Cargo.toml
17:lru-cache = { git = "https://github.com/nervosnetwork/lru-cache" }

script/Cargo.toml
14:ckb-vm = { git = "https://github.com/nervosnetwork/ckb-vm", rev = "dd90ed1" }

db/Cargo.toml
11:rocksdb = { git = "https://github.com/nervosnetwork/rust-rocksdb" }

pool/Cargo.toml
16:lru-cache = { git = "https://github.com/nervosnetwork/lru-cache" }
17:linked-hash-map = { git = "https://github.com/nervosnetwork/linked-hash-map", rev = "df27f21" }

miner/Cargo.toml
27:lru-cache = { git = "https://github.com/nervosnetwork/lru-cache" }

util/crypto/Cargo.toml
9:secp256k1 = { git = "https://github.com/nervosnetwork/rust-secp256k1", optional = true, features = ["rand"] }

[doitian]

@jjyr please check whether jjyr/r2d2-sqlite has protected master branch

[zhangsoledad]

• [x] lru-cache
• [x] linked-hash-map
• [x] rust-rocksdb
• [x] r2d2-sqlite
• [x] ckb-vm

[jjyr]

https://github.com/nervosnetwork/ckb/pull/237

[doitian]

done