Fixed some outdated links in spec/ (#97)

spec/replay-protected-sighash.md

@@ -30,7 +30,7 @@ The proposed digest algorithm is only used when the `SIGHASH_FORKID` bit in the
 
 In presence of the `SIGHASH_FORKID` flag in the signature's sighash type, the proposed algorithm is used.
 
-Signatures using the `SIGHASH_FORKID` digest method must be rejected before [UAHF](https://github.com/Bitcoin-UAHF/spec/blob/master/uahf-technical-spec.md) is activated.
+Signatures using the `SIGHASH_FORKID` digest method must be rejected before [UAHF](https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/uahf-technical-spec.md) is activated.
 
 In order to ensure proper activation, the reference implementation uses the `SCRIPT_ENABLE_SIGHASH_FORKID` flag when executing `EvalScript` .
 
@@ -206,4 +206,4 @@ In that case the code can be simplified to omit the function.
 
 <a name="OP_CHECKSIG">[3]</a> https://en.bitcoin.it/wiki/OP_CHECKSIG
 
-<a name="uahfspec">[4]</a> https://github.com/Bitcoin-UAHF/spec/blob/master/uahf-technical-spec.md
+<a name="uahfspec">[4]</a> https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/uahf-technical-spec.md

spec/uahf-technical-spec.md

@@ -277,7 +277,7 @@ as "CASH" in user interfaces of some Bitcoin clients (BU, ABC).
 
 [3] [Digest for replay protected signature verification accross hard forks](replay-protected-sighash.md)
 
-[4] https://github.com/Bitcoin-UAHF/spec/blob/master/uahf-test-plan.md
+[4] https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/uahf-test-plan.md
 
 
 END

spec/uahf-test-plan.md

@@ -102,7 +102,7 @@ provide tool to truncate the data back to pre-fork block?)
 
 ## References
 
-[1] https://github.com/Bitcoin-UAHF/spec/blob/master/uahf-technical-spec.md
+[1] https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/uahf-technical-spec.md
 
 
 END