Modifiled several non-source files for Julia v1.8.0

Author: BoundaryValueProblems

.github/workflows/CI.yml

@@ -21,6 +21,7 @@ jobs:
         version:
           - '1.6'
           - '1.7'
+          - '1.8'
           - 'nightly'
         os:
           - ubuntu-latest

.github/workflows/Documenter.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@latest
         with:
-          version: '1.6'
+          version: '1.8'
       - name: Install dependencies
         run: julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
       - name: Build and deploy

Project.toml

@@ -41,7 +41,7 @@ QuadGK = "2.4"
 Reexport = "1"
 SimpleWeightedGraphs = "1.1.1"
 StatsBase = "0.33.6"
-julia = "1.6, 1.7"
+julia = "1.6, 1.7, 1.8"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"