Bump regex from 1.3.4 to 1.3.6

Bumps [regex](https://github.com/rust-lang/regex) from 1.3.4 to 1.3.6.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@1.3.4...1.3.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.toml

@@ -35,7 +35,7 @@ jsonrpc-derive = { path = "crates/jsonrpc_derive" }
 log = "0.4.6"
 once_cell = "1.3.1"
 path-clean = "0.1.0"
-regex = "1.3.4"
+regex = "1.3.6"
 serde = { version = "1.0.104", features = ["derive", "rc"] }
 serde_json = "1.0.48"
 serde_repr = "0.1"

crates/texlab_citeproc/Cargo.toml

@@ -17,7 +17,7 @@ html2md = "0.2.9"
 itertools = "0.8.2"
 lalrpop-util = "0.17.2"
 once_cell = "1.3.1"
-regex = "1.3.4"
+regex = "1.3.6"
 serde = { version = "1.0.104", features = ["derive", "rc"] }
 serde_json = "1.0.48"
 texlab-protocol = { path = "../texlab_protocol" }

crates/texlab_completion/Cargo.toml

@@ -12,7 +12,7 @@ futures-boxed = { path = "../futures_boxed" }
 itertools = "0.8.2"
 log = "0.4.6"
 once_cell = "1.3.1"
-regex = "1.3.4"
+regex = "1.3.6"
 serde = { version = "1.0.104", features = ["derive", "rc"] }
 serde_json = "1.0.48"
 texlab-distro = { path = "../texlab_distro" }