chore: remove istanbul & semantic release. add nyc

.gitignore

@@ -2,4 +2,5 @@ node_modules
 .DS_Store
 coverage/*
 scripts/*.svg
-config/*.test.json
+config/*.test.json
+.nyc_output/

.travis.yml

@@ -3,18 +3,16 @@ cache:
   directories:
     - node_modules
 notifications:
+  slack: dadi:pnhiL60xOrm7GOglHUmb7xHK
   email: false
 node_js:
-  - 'node'
-  - 'lts/*'
   - '8'
+  - '10'
+  - 'lts/*'
 before_script:
   - npm prune
-after_success:
-  - npm run semantic-release
 branches:
   except:
     - /^v\d+\.\d+\.\d+$/
 services:
   - mongodb
-before_install: if [[ `npm -v` != 3* ]]; then npm i -g npm@latest; fi

README.md

@@ -4,7 +4,6 @@
 [![Coverage Status](https://coveralls.io/repos/github/dadi/api-filestore/badge.svg?branch=master)](https://coveralls.io/github/dadi/api-filestore?branch=master)
 [![Build Status](https://travis-ci.org/dadi/api-filestore.svg?branch=master)](https://travis-ci.org/dadi/api-filestore)
 [![JavaScript Style Guide](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat-square)](http://standardjs.com/)
-[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg?style=flat-square)](https://github.com/semantic-release/semantic-release)
 
 ## Requirements