Minor cleanups (#1110)

- Delete `.travis.yml`
- Add `[compat]` to `docs/Project.toml`
- CI: switch from "nightly" to "pre"

.github/workflows/CI.yml

@@ -13,6 +13,7 @@ jobs:
         version:
           - "1.6"
           - "1"
+          - "pre"
         os:
           - ubuntu-latest
           - macOS-latest
@@ -21,7 +22,7 @@ jobs:
           - x64
     steps:
       - uses: actions/checkout@v4
-      - uses: julia-actions/setup-julia@v1
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}

docs/Project.toml

@@ -1,6 +1,11 @@
 [deps]
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 Literate = "98b081ad-f1c9-55d3-8b20-4c87d4299306"
 NLSolversBase = "d41bc354-129a-5804-8e4c-c37616107c6c"
+Optim = "429524aa-4258-5aef-a3af-852621145aeb"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
-ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
+
+[compat]
+Documenter = "1"
+Literate = "2"