add call_032.md, and links to this and call ethereum#31 in the README.md

These notes we done by Jim Bennett.

README.md

@@ -39,3 +39,5 @@ This repo hosts a collection of [standards](./interop) to aid in client interope
  28 | Thu, Nov 7, 2019 14:00 UTC      | [agenda](https://github.com/ethereum/eth2.0-pm/issues/101) \| [notes](eth2.0-implementers-calls/call_028.md) \| No Reddit | [video](https://www.youtube.com/watch?v=DzLrxuN55VA) |
  29 | Thu, Dec 5, 2019 14:00 UTC     | [agenda](https://github.com/ethereum/eth2.0-pm/issues/108) \| [notes](eth2.0-implementers-calls/call_029.md) \| No Reddit | [video](https://www.youtube.com/watch?v=MxeEWmEdb5E) |
  30 | Thu, Dec 19, 2019 14:00 UTC      | [agenda](https://github.com/ethereum/eth2.0-pm/issues/112) \| [notes](eth2.0-implementers-calls/call_030.md) \| [Reddit](https://www.reddit.com/r/ethereum/comments/ecrgfh/live_eth20_call_30_20191219_1400_gmt/) | [video](https://www.youtube.com/watch?v=LYLiqpj-wiE) |
+ 31 | Thu, Dec 19, 2019 14:00 UTC      | [agenda](https://github.com/ethereum/eth2.0-pm/issues/118) \| [notes](eth2.0-implementers-calls/call_031.md) \| [Reddit](https://www.reddit.com/r/ethereum/comments/em7erh/live_ethereum_20_call_31_202019_1400_gmt/) | [video](https://www.youtube.com/watch?v=u2w4EO9YepI) |
+ 32 | Thu, Dec 19, 2019 14:00 UTC      | [agenda](https://github.com/ethereum/eth2.0-pm/issues/123) \| [notes](eth2.0-implementers-calls/call_032.md) \| [Reddit](https://www.reddit.com/r/ethereum/comments/esq90y/live_ethereum_20_call_32_2020123_1400_gmt/) | [video](https://www.youtube.com/watch?v=kt59-FEeWTI) |