Bump MSRV to 1.47.0

We'll be needing it shortly for ff et al.

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.44.1
+          toolchain: 1.47.0
           override: true
 
       - name: Fetch path to Zcash parameters
@@ -56,7 +56,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.44.1
+          toolchain: 1.47.0
           override: true
       - name: Add target
         run: rustup target add ${{ matrix.target }}
@@ -79,7 +79,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.44.1
+          toolchain: 1.47.0
           override: true
       # Build benchmarks to prevent bitrot
       - name: Build benchmarks
@@ -89,20 +89,20 @@ jobs:
           args: --all --benches
 
   clippy:
-    name: Clippy (1.44.1)
+    name: Clippy (1.47.0)
     timeout-minutes: 30
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.44.1
+          toolchain: 1.47.0
           components: clippy
           override: true
       - name: Run clippy
         uses: actions-rs/clippy-check@v1
         with:
-          name: Clippy (1.44.1)
+          name: Clippy (1.47.0)
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --all-features --all-targets -- -D warnings
 
@@ -199,7 +199,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.44.1
+          toolchain: 1.47.0
           override: true
 
       # cargo fmt does not build the code, and running it in a fresh clone of

rust-toolchain

@@ -1 +1 @@
-1.44.1
+1.47.0

zcash_client_backend/CHANGELOG.md

@@ -16,6 +16,7 @@ and this library adheres to Rust's notion of
 - First alpha of TZE support, behind the `zfuture` feature flag.
 
 ### Changed
+- MSRV is now 1.47.0.
 - `epk` fields and return values were changed from a `jubjub::SubgroupPoint` to
   a `jubjub::ExtendedPoint`, to match the change to the `zcash_primitives`
   decryption APIs:

zcash_client_sqlite/CHANGELOG.md

@@ -20,6 +20,7 @@ same as before, but have been reorganized.
 - `zcash_client_sqlite::NoteId`
 
 ### Changed
+- MSRV is now 1.47.0.
 - APIs now take `&BlockDB` and `&WalletDB<P>` arguments, instead of paths to the
   block cache and wallet databases.
 - The library no longer uses the `mainnet` feature flag to specify the network

zcash_primitives/CHANGELOG.md

@@ -73,6 +73,7 @@ and this library adheres to Rust's notion of
   - `zcash_primitives::zip32::DiversifierIndex: Default`
 
 ### Changed
+- MSRV is now 1.47.0.
 - Trial decryption using the APIs in `zcash_primitives::note_encryption` is now
   over 60% faster at detecting which notes are relevant.
   - Part of this improvement was achieved by changing the APIs to take `epk` as

zcash_proofs/CHANGELOG.md

@@ -25,6 +25,7 @@ and this library adheres to Rust's notion of
 - `zcash_proofs::sapling::SaplingVerificationContext: Default`
 
 ### Changed
+- MSRV is now 1.47.0.
 - `zcash_proofs::load_parameters` now returns `ZcashParameters`.
 
 ## [0.4.0] - 2020-09-09