Update LICENSE.txt
Update LICENSE.txt

Thanks @blobgo. Resolves #16.
mpawlowski/onetimesecret,GeneralFox/onetimesecret,onetimesecret/onetimesecret,GeneralFox/onetimesecret,GeneralFox/onetimesecret,GeneralFox/onetimesecret,GeneralFox/onetimesecret,mpawlowski/onetimesecret,onetimesecret/onetimesecret,onetimesecret/onetimesecret,namshi/onetimesecret,namshi/onetimesecret,onetimesecret/onetimesecret,namshi/onetimesecret,onetimesecret/onetimesecret,namshi/onetimesecret,namshi/onetimesecret,mpawlowski/onetimesecret,mpawlowski/onetimesecret