Add more basic encodable types

Fixes #10

Author: danfinlay

index.ts

@@ -174,7 +174,25 @@ function generatePacketHashGetters (types, typeName, fields, packetHashGetters:
 }
 
 function getEncodedValueFor (field) {
-  const basicEncodableTypes = ['address', 'bool', 'bytes32', 'int', 'uint', 'uint256'];
+  const basicEncodableTypes = [
+    'address',
+    'bool',
+    'string',
+    'int',
+    'uint',
+    'int8',
+    'uint8',
+    'int16',
+    'uint16',
+    'int256',
+    'uint256',
+    'bytes32',
+    'bytes16',
+    'bytes8',
+    'bytes4',
+    'bytes2',
+    'bytes1',
+  ];
   const hashedTypes = ['bytes', 'string'];
   if (basicEncodableTypes.includes(field.type)) {
     return `_input.${field.name}`;