chore(docs): BigInt in API docs

Author: rvagg

README.md

@@ -98,7 +98,7 @@ bl.pipe(fs.createWriteStream('gibberish.txt'))
   * <a href="#duplicate"><code>bl.<b>duplicate()</b></code></a>
   * <a href="#consume"><code>bl.<b>consume(bytes)</b></code></a>
   * <a href="#toString"><code>bl.<b>toString([encoding, [ start, [ end ]]])</b></code></a>
-  * <a href="#readXX"><code>bl.<b>readDoubleBE()</b></code>, <code>bl.<b>readDoubleLE()</b></code>, <code>bl.<b>readFloatBE()</b></code>, <code>bl.<b>readFloatLE()</b></code>, <code>bl.<b>readInt32BE()</b></code>, <code>bl.<b>readInt32LE()</b></code>, <code>bl.<b>readUInt32BE()</b></code>, <code>bl.<b>readUInt32LE()</b></code>, <code>bl.<b>readInt16BE()</b></code>, <code>bl.<b>readInt16LE()</b></code>, <code>bl.<b>readUInt16BE()</b></code>, <code>bl.<b>readUInt16LE()</b></code>, <code>bl.<b>readInt8()</b></code>, <code>bl.<b>readUInt8()</b></code></a>
+  * <a href="#readXX"><code>bl.<b>readDoubleBE()</b></code>, <code>bl.<b>readDoubleLE()</b></code>, <code>bl.<b>readFloatBE()</b></code>, <code>bl.<b>readFloatLE()</b></code>, <code>bl.<b>readBigInt64BE()</b></code>, <code>bl.<b>readBigInt64LE()</b></code>, <code>bl.<b>readBigUInt64BE()</b></code>, <code>bl.<b>readBigUInt64LE()</b></code>, <code>bl.<b>readInt32BE()</b></code>, <code>bl.<b>readInt32LE()</b></code>, <code>bl.<b>readUInt32BE()</b></code>, <code>bl.<b>readUInt32LE()</b></code>, <code>bl.<b>readInt16BE()</b></code>, <code>bl.<b>readInt16LE()</b></code>, <code>bl.<b>readUInt16BE()</b></code>, <code>bl.<b>readUInt16LE()</b></code>, <code>bl.<b>readInt8()</b></code>, <code>bl.<b>readUInt8()</b></code></a>
   * <a href="#ctorStream"><code><b>new BufferListStream([ callback ])</b></code></a>
 
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@@ -194,7 +194,7 @@ console.log(bl.toString())
 
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 <a name="readXX"></a>
-### bl.readDoubleBE(), bl.readDoubleLE(), bl.readFloatBE(), bl.readFloatLE(), bl.readInt32BE(), bl.readInt32LE(), bl.readUInt32BE(), bl.readUInt32LE(), bl.readInt16BE(), bl.readInt16LE(), bl.readUInt16BE(), bl.readUInt16LE(), bl.readInt8(), bl.readUInt8()
+### bl.readDoubleBE(), bl.readDoubleLE(), bl.readFloatBE(), bl.readFloatLE(), bl.readBigIntBE(), bl.readBigIntLE(), bl.readBigUIntBE(), bl.readBigUIntLE(), bl.readInt32BE(), bl.readInt32LE(), bl.readUInt32BE(), bl.readUInt32LE(), bl.readInt16BE(), bl.readInt16LE(), bl.readUInt16BE(), bl.readUInt16LE(), bl.readInt8(), bl.readUInt8()
 
 All of the standard byte-reading methods of the `Buffer` interface are implemented and will operate across internal Buffer boundaries transparently.