Version bump

Thanks to Martin Larralde and Nolan Darilek the following features are
available:

- enable/disable static and shared library creation
- `LDFLAGS/CFLAGS/CXXFLAGS` support
- custom `make` targets

Author: lu-zero

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "autotools"
-version = "0.1.3"
+version = "0.1.4"
 authors = ["Luca Barbato <[email protected]>"]
 license = "MIT"
 keywords = ["build-dependencies"]