drop support for old stackage releases

I don't think it's worth maintining these with the aeson issue

explain drop of support

.github/workflows/stack.yaml

@@ -18,7 +18,7 @@ jobs:
         os: [ubuntu-latest, macos-latest,
           # windows-latest # TODO add windows support
         ]
-        resolver: [nightly, lts-18, lts-17, lts-19]
+        resolver: [nightly, lts-19, lts-20]
 
     steps:
       - name: Clone project

ChangeLog.md

@@ -3,6 +3,10 @@
 + Bump unix-compat bound to accept 0.7
 + Add upper bounds to all dependencies in the main library
 + Run cabal-fmt
++ Drop support for stackage lts-17 and lts-18
+  I don't think it's worth mainting these with the aeson issues involved.
+  Eg you open yourself to a [DoS attack](https://github.com/haskell/aeson/issues/864)
+  by staying on these old versions
 
 ## 2.1
 

stack.yaml

@@ -2,6 +2,4 @@ flags:
   keter: {}
 packages:
 - '.'
-extra-deps: 
-  - http-reverse-proxy-0.6.0.1@sha256:0eb27277306b4950046bf9acc2c721f219d6e9eb939d950cd8cc32c4b9433800,2542
-resolver: lts-18
+extra-deps: []

stack_lts-101.yaml

@@ -1,10 +0,0 @@
-flags:
-  keter: {}
-packages:
-- '.'
-extra-deps:
-  - unix-compat-0.4.3.1@sha256:a291f209e9c9723204c49c978ed2c53997dbc9666e53fe7bf7a3548b2c8bb22c,2030
-  - process-1.4.3.0@sha256:cf30533f073721fd059790f0b963fb9b57e3507cffef5141e9377449570b07ca,2021
-  - wai-3.2.2@sha256:0d38213a13820a418591fa69f767c44616574c833b1fc9e1425ac59ed3d35704,1763
-  - fsnotify-0.3.0.1@sha256:58bb530d7acf93eb4ed69473e32a1485581815f04f69dfc8a278523781ba49dd,2988
-resolver: lts-10.1