Philippe Castonguay issues

Results 20 issues of


                                            Philippe Castonguay

N8 - Minted liquidity tokens can round to zero

![image](https://user-images.githubusercontent.com/9306422/74190431-58297d80-4c20-11ea-8b18-bb5019bd1aa4.png)

Pass transferData instead of signedData when gasReceipt is passed

L2 - Noncompliant with `_operator` definitions by ERC-1155

![image](https://user-images.githubusercontent.com/9306422/71834237-b6d96580-307c-11ea-8c30-4a322707db37.png) by @Agusx1211

bug

wontfix

N13 - `msg.sender` is defined as operator during `_mint` and `_burn`

![image](https://user-images.githubusercontent.com/9306422/71834786-02404380-307e-11ea-9b2a-ce0d6a7bef1a.png) By @Agusx1211

H1 - GasReceipt injection using `transferData`

![image](https://user-images.githubusercontent.com/9306422/71834071-52b6a180-307c-11ea-8f37-dff0939d5319.png) by @Agusx1211

bug

Add .gitattributes file for Vyper syntax highlight on github

> Since .vy is not official a language supported by any syntax highlights or linter, it is recommended to name your vyper file into .v.py to have a python highlights....

Coins not showing in wallet

### Problem I purchased my first siacoins via Shapeshift.io and I transferred them to the first address generated with my seed, but I don't see them in my wallet. ###...

N19 - Unused variable `_data` on `onERC1155Received()`

![image](https://user-images.githubusercontent.com/9306422/71834924-6105bd00-307e-11ea-8e63-a598747c9e3a.png) By @Agusx1211

N17 - Hardcoded tokenId 1 as ETH on `MetaERC20Wrapper.sol`

![image](https://user-images.githubusercontent.com/9306422/71834877-42072b00-307e-11ea-8360-27d346622fa4.png) By @Agusx1211

Add prefix for EIP-191 signature before hashing

Allows Sequence wallet to login on Opensea among other dapps.