Update to use level 8 (#199)

* level ^8.0.0 https://github.com/Level/level/blob/master/UPGRADING.md

* test for #197

* create a persist-level test folder for #197

* Update from memdb to level-mem ; remove implicit sublevel support

* Remove no-longer-supported approcimateSize during test inits

* Styling fixes to lib/readstream

* Ran browserify to update in-repo built files

* Using many-level instead of deprecated multilevel ; using level-read-stream instead of workaround

* jshint fixes

* Run browserify.sh to re-generate pre-built files

* Removed changelog.md, doesn't make sense in the context

* Update CI to only run on node 18/20

* Rewrote contributors table to gh-style markdown to familiarize myself with markdown again

* Removed broken dependency status link from readme

* Minor styling in readme on first few paragraphs

* Updated readme/install section to reflect current state

* Readme updates to reflect current initializers

* Removed unused level-iterator-stream dependency

* Update readme table of contents

* Nicer contributor alignment, like previous readme version

---------

Co-authored-by: Scenaristeur <scenaristeur@gmail.com>

.github/workflows/nodejs.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x]
+        node-version: [18.x, 20.x]
     steps:
     - uses: actions/checkout@v2
     - name: Use Node.js ${{ matrix.node-version }}
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16.x]
+        node-version: [20.x]
     steps:
     - uses: actions/checkout@v2
     - name: Use Node.js ${{ matrix.node-version }}

.gitignore

@@ -17,5 +17,6 @@ npm-debug.log
 docs
 .DS_Store
 coverage
+db_test
 
 package-lock.json

.jshintrc

@@ -14,6 +14,7 @@
   "eqnull": true,
   "laxcomma": true,
   "quotmark": true,
+  "esversion": 6,
   "globals": {
     "describe": false,
     "beforeEach": false,