Merge #1529

1529: Bump from 2020.3.16 to 2020.4.1 r=Anviking a=Anviking

# Issue Number

Part of release checklist.

# Overview

```
set OLD_VERSION "2020.3.16"
set NEW_VERSION "2020.4.1"
find nix -name "*.nix" -type file | xargs perl -i -pe "s/$OLD_VERSION/$NEW_VERSION/"
find lib -name "*.cabal" -type file | xargs perl -i -pe "s/$OLD_VERSION/$NEW_VERSION/"
```

# Comments

- We should have a button or script for this step at some point 😛
- `git grep "2020.3.16"` is empty

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Co-authored-by: Johannes Lund <johannes.lund@iohk.io>

lib/byron/cardano-wallet-byron.cabal

@@ -1,5 +1,5 @@
 name:                cardano-wallet-byron
-version:             2020.3.16
+version:             2020.4.1
 synopsis:            Wallet backend protocol-specific bits implemented using byron nodes
 description:         Please see README.md
 homepage:            https://github.com/input-output-hk/cardano-wallet

lib/cli/cardano-wallet-cli.cabal

@@ -1,5 +1,5 @@
 name:                cardano-wallet-cli
-version:             2020.3.16
+version:             2020.4.1
 synopsis:            Utilities for a building Command-Line Interfaces
 homepage:            https://github.com/input-output-hk/cardano-wallet
 author:              IOHK Engineering Team

lib/core-integration/cardano-wallet-core-integration.cabal

@@ -1,5 +1,5 @@
 name:                cardano-wallet-core-integration
-version:             2020.3.16
+version:             2020.4.1
 synopsis:            Core integration test library.
 description:         Shared core functionality for our integration test suites.
 homepage:            https://github.com/input-output-hk/cardano-wallet

lib/core/cardano-wallet-core.cabal

@@ -1,5 +1,5 @@
 name:                cardano-wallet-core
-version:             2020.3.16
+version:             2020.4.1
 synopsis:            The Wallet Backend for a Cardano node.
 description:         Please see README.md
 homepage:            https://github.com/input-output-hk/cardano-wallet

lib/jormungandr/cardano-wallet-jormungandr.cabal

@@ -1,5 +1,5 @@
 name:                cardano-wallet-jormungandr
-version:             2020.3.16
+version:             2020.4.1
 synopsis:            Wallet backend protocol-specific bits implemented using Jörmungandr
 description:         Please see README.md
 homepage:            https://github.com/input-output-hk/cardano-wallet

lib/launcher/cardano-wallet-launcher.cabal

@@ -1,5 +1,5 @@
 name:                cardano-wallet-launcher
-version:             2020.3.16
+version:             2020.4.1
 synopsis:            Utilities for a building commands launcher
 homepage:            https://github.com/input-output-hk/cardano-wallet
 author:              IOHK Engineering Team

lib/test-utils/cardano-wallet-test-utils.cabal

@@ -1,5 +1,5 @@
 name:                cardano-wallet-test-utils
-version:             2020.3.16
+version:             2020.4.1
 synopsis:            Shared utilities for writing unit and property tests.
 description:         Shared utilities for writing unit and property tests.
 homepage:            https://github.com/input-output-hk/cardano-wallet

lib/text-class/text-class.cabal

@@ -1,5 +1,5 @@
 name:                text-class
-version:             2020.3.16
+version:             2020.4.1
 synopsis:            Extra helpers to convert data-types to and from Text
 homepage:            https://github.com/input-output-hk/cardano-wallet
 author:              IOHK Engineering Team