Merge pull request #2178 from pythcoiner/bip_68

BIP68: fix wrong upper bound for nHeight

Author: murchandamus

bip-0068.mediawiki

@@ -240,7 +240,7 @@ Additionally, this BIP specifies only 16 bits to actually encode relative lock-t
 The most efficient way to calculate sequence number from relative lock-time is with bit masks and shifts:
 
 <pre>
-    // 0 <= nHeight < 65,535 blocks (1.25 years)
+    // 0 <= nHeight <= 65,535 blocks (1.25 years)
     nSequence = nHeight;
     nHeight = nSequence & 0x0000ffff;