adding CompatHelper, and adding dependency compat versions

Author: funnell

.github/workflows/CompatHelper.yml

@@ -0,0 +1,17 @@
+name: CompatHelper
+
+on:
+  schedule:
+    - cron: '00 00 * * *'
+
+jobs:
+  CompatHelper:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Pkg.add("CompatHelper")
+        run: julia -e 'using Pkg; Pkg.add("CompatHelper")'
+      - name: CompatHelper.main()
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COMPATHELPER_PRIV: ${{ secrets.COMPATHELPER_PRIV }}
+        run: julia -e 'using CompatHelper; CompatHelper.main()'

Project.toml

@@ -11,4 +11,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
-julia = "≥ 0.7.0"
+julia = "~0.7.0, ~1.0, ~1.1, ~1.2, ~1.3, ~1.4"
+DataFrames = "0.17.1, 0.21.1"
+NLopt = "0.5.1, 0.6.0"
+SpecialFunctions = "0.8.0, 0.10.3"