Bump version to 0.0.4

Signed-off-by: Daniel Schnell <dschnell@skerpa.com>
* Fix for #3: implicit resource LDFLAGS are replaced via platform specific resource LDFLAGS
* Change keys of return value hash of Toolchain#linker_line_for to use symbols instead of strings

Signed-off-by: Daniel Schnell <dschnell@skerpa.com>