Upgrade ExcelJS to 4.2.0 & Upgrade deps (#54)

* Upgrade deps, Upgrade exceljs to 4+

* Remove supporting for node 8&9

.github/workflows/nodejs.yml

@@ -9,7 +9,8 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x, 9.x, 10.x, 11.x, 12.x, 13.x, 14.x]
+#        node-version: [8.x, 9.x, 10.x, 11.x, 12.x, 13.x, 14.x] # version 8 and 9 isn't supported in ExcelJS as default - may I resolve it further (or ignore)
+        node-version: [10.x, 11.x, 12.x, 13.x, 14.x]
 
     steps:
     - uses: actions/checkout@28c7f3d2b5162b5ddd3dfd9a45aa55eaf396478b # @v2; SECURE ALERT: always use hash instead of tags for actions

README.md

@@ -82,9 +82,9 @@ for more example I invite to tests data: [click here and check `Renderer` folder
 
 ## Node:
 
-| Node version |  8  |  9  |  10 |  11 |  12 |  13 |  14 |
-|--------------|-----|-----|-----|-----|-----|-----|-----|
-| Supported?   | 🟢  | 🟢 | 🟢 |  🟢 | 🟢 |  🟢 | 🟢 |
+| Node version |  10 |  11 |  12 |  13 |  14 |
+|--------------|-----|-----|-----|-----|-----|
+| Supported?   | 🟢 |  🟢 | 🟢 |  🟢 | 🟢 |
 
 Discovered in: [#14](https://github.com/Siemienik/xlsx-renderer/issues/14)