Add typesync rc file support

[septs]

Configure ignore dependencies, ignore packages, etc via typesync rc file.

sample file path:

project directory/.typesync-rc.json
project directory/[any first-level subdirectory]/.typesync-rc.json

sample file format:

{
  "ignoreDependencies": ["peer"],
  "ignorePackages": ["express"]
}

[Jeff Hansen]

What is the difference between "dependencies" and "packages"? I find them ambiguous.

[septs]

ignoreDependencies is to keep this feature

typesync/README.md

Lines 40 to 48 in 23f8a5c

 ## `--ignoredeps` 
  
 To ignore certain sections, you can use the `--ignoredeps=` flag. For example, to ignore `devDependencies`, use `--ignoredeps=dev`. To ignore multiple, comma-separate them, like this: `--ignoredeps=deps,peer` (ignores `dependencies` and `peerDependencies`). 
  
 * `--ignoredeps=deps` — ignores `dependencies` 
 * `--ignoredeps=dev` — ignores `devDependencies` 
 * `--ignoredeps=peer` — ignores `peerDependencies` 
 * `--ignoredeps=optional` — ignores `optionalDependencies` 
  

[septs]

ignorePackages is ignore specific single package,
e.q: #46 the case

[Jeff Hansen]

Ah gotcha!

[septs]

I don't know where the entry settings for loading configuration file should be
If you can tell me, I can submit a pull request

[Jeff Hansen]

Could use cosmoconfig and put it behind a configuration service so it can be faked for testing.