Poseidon Sponge Hash with different frame sizes (#52)

* Poseidon Sponge Hash with different frame sizes
* Update deps. Bump go version
* Update & fix linter.
* Refactor a bit.
* Reduce gc pressure

.github/workflows/lint.yml

@@ -1,16 +1,18 @@
 name: Lint
-on: [ push, pull_request ]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - name: Install Go
-        uses: actions/setup-go@v1
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
         with:
-          go-version: 1.16.x
-      - name: Checkout code
-        uses: actions/checkout@v2
-      - name: Lint
-        run: |
-          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.30.0
-          $(go env GOPATH)/bin/golangci-lint run --timeout=5m -c .golangci.yml
+          go-version: 1.20.x
+      - uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.51.1

.github/workflows/test.yml

@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [ 1.16.x, 1.17.x ]
+        go-version: [ 1.18.x, 1.19.x, 1.20.x ]
         goarch: [ "amd64", "386" ]
     runs-on: ubuntu-latest
     steps: