Add support of spell check via aspell (#462)

* Add support of spellcheck via aspell

* Fix incorrect changes

* Another incorrect change

* Add newline to end of travis config

* Actualize dictonary

* actualize spellcheck dictonary

* Add some more words

* Redone stages

.travis.yml

@@ -1,5 +1,17 @@
 language: node_js
 node_js: "10"
 
-install: npm install -g markdownlint-cli
-script: markdownlint CHANGELOG.md
+addons:
+  apt:
+    packages:
+      - aspell
+      - aspell-en
+
+jobs:
+  include:
+    - stage: markdownlint
+      script: 
+      - npm install -g markdownlint-cli
+      - markdownlint CHANGELOG.md
+    - stage: spellcheck
+      script: cat CHANGELOG.md | aspell --lang=en --encoding=utf-8 --personal=./.aspell.en.pws list