Add common VCS dirs to default ignore list (fixes #54)

Cargo.lock

@@ -1,6 +1,6 @@
 [root]
 name = "watchexec"
-version = "1.8.1"
+version = "1.8.2"
 dependencies = [
  "clap 2.22.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "watchexec"
-version = "1.8.1"
+version = "1.8.2"
 authors = ["Matt Green <mattgreenrocks@gmail.com>"]
 description = "Executes commands in response to file modifications"
 documentation = "https://github.com/mattgreen/watchexec"

src/cli.rs

@@ -140,7 +140,10 @@ pub fn get_args() -> Args {
     let mut ignores = vec![];
     let default_ignores = vec![format!("*{}.DS_Store", MAIN_SEPARATOR),
                                String::from("*.pyc"),
-                               String::from("*.swp")];
+                               String::from("*.swp"),
+                               String::from("*/.git/*"),
+                               String::from("*/.hg/*"),
+                               String::from("*/.svn/*")];
 
 
     if args.occurrences_of("no-default-ignore") == 0 {