Tweak README
rename SUFFIX as PREFIX in ENVCHAIN_SERVICE_PREFIX
Give up assert()
v0.0.3
Merge pull request #2 'rename SUFFIX as PREFIX in ENVCHAIN_SERVICE_PREFIX'

Closes #2

Conflicts:
	envchain.c
Merge pull request #1 from BanzaiMan/doc-tweak-readme

Tweak README
Fix grammatical and formating errors
Merge pull request #3 from BanzaiMan/doc-tweak-readme

Fix grammatical and formating errors
Never fail when --noecho with empty string

    $ ./envchain -s --noecho a foo
    a.foo (noecho):Assertion failed: (len >= 0), function envchain_noecho_read, file envchain.c, line 427.
    Abort trap: 6

Fixes #4