Updated Several Hello World Featured Images (TheRenegadeCoder#366)

* Updated Hello World in Brainfuck Featured Image

* Update 2018-11-01-dart.md

* Update 2018-11-01-lua.md

* Update 2018-11-01-moonscript.md

* Update 2018-11-01-opa.md

* Update 2018-11-01-powershell.md

* Update 2018-11-01-r.md

Author: jrg94

projects/hello-world/_posts/2018-11-01-brainfuck.md

@@ -1,8 +1,8 @@
 ---
 title: Hello World in Brainfuck
 layout: default
-last-modified: 2020-05-02
-featured-image: hello-world-in-brainfuck-featured-image.JPEG
+last-modified: 2020-10-15
+featured-image: hello-world-in-brainfuck.jpg
 tags: [brainfuck, hello-world]
 authors:
   - chrboe

projects/hello-world/_posts/2018-11-01-dart.md

@@ -1,8 +1,8 @@
 ---
 title: Hello World in Dart
 layout: default
-last-modified: 2020-05-02
-featured-image: hello-world-in-dart-featured-image.JPEG
+last-modified: 2020-10-15
+featured-image: hello-world-in-dart.jpg
 tags: [dart, hello-world]
 authors:
   - stargator

projects/hello-world/_posts/2018-11-01-lua.md

@@ -1,8 +1,8 @@
 ---
 title: Hello World in Lua
 layout: default
-last-modified: 2020-05-02
-featured-image: hello-world-in-lua-featured-image.JPEG
+last-modified: 2020-10-15
+featured-image: hello-world-in-lua.jpg
 tags: [lua, hello-world]
 authors:
   - the_renegade_coder

projects/hello-world/_posts/2018-11-01-moonscript.md

@@ -1,8 +1,8 @@
 ---
 title: Hello World in MoonScript
 layout: default
-last-modified: 2020-05-02
-featured-image: hello-world-in-moonscript-featured-image.JPEG
+last-modified: 2020-10-15
+featured-image: hello-world-in-moonscript.jpg
 tags: [moonscript, hello-world]
 authors:
   - bassem_mohamed

projects/hello-world/_posts/2018-11-01-opa.md

@@ -1,8 +1,8 @@
 ---
 title: Hello World in Opa
 layout: default
-last-modified: 2020-05-02
-featured-image: hello-world-in-opa-featured-image.JPEG
+last-modified: 2020-10-15
+featured-image: hello-world-in-opa.jpg
 tags: [opa, hello-world]
 authors:
   - nicovillanueva

projects/hello-world/_posts/2018-11-01-powershell.md

@@ -1,8 +1,8 @@
 ---
 title: Hello World in PowerShell
 layout: default
-last-modified: 2020-05-02
-featured-image: hello-world-in-powershell-featured-image.JPEG
+last-modified: 2020-10-15
+featured-image: hello-world-in-powershell.jpg
 tags: [powershell, hello-world]
 authors:
   - alcha

projects/hello-world/_posts/2018-11-01-r.md

@@ -1,8 +1,8 @@
 ---
 title: Hello World in R
 layout: default
-last-modified: 2020-05-02
-featured-image: hello-world-in-r-featured-image.JPEG
+last-modified: 2020-10-15
+featured-image: hello-world-in-r.jpg
 tags: [r, hello-world]
 authors:
   - alexandra_woerner