Replace foot marks with back ticks

Author: code-warrior

gulpfile.js

@@ -107,13 +107,14 @@ let transpileJSForProd = () => {
 let compressImages = () => {
     return src(`dev/img/**/*`)
         .pipe(imageCompressor({
-            optipng: ['-i 1', '-strip all', '-fix', '-o7', '-force'],
-            pngquant: ['--speed=1', '--force', 256],
-            zopflipng: ['-y', '--lossy_8bit', '--lossy_transparent'],
-            jpegRecompress: ['--strip', '--quality', 'medium', '--min', 40, '--max', 80],
-            mozjpeg: ['-optimize', '-progressive'],
-            gifsicle: ['--optimize'],
-            svgo: ['--enable', 'cleanupIDs', '--disable', 'convertColors'],
+            optipng: [`-i 1`, `-strip all`, `-fix`, `-o7`, `-force`],
+            pngquant: [`--speed=1`, `--force`, 256],
+            zopflipng: [`-y`, `--lossy_8bit`, `--lossy_transparent`],
+            jpegRecompress: [`--strip`, `--quality`, `medium`, `--min`, 40,
+                `--max`, 80],
+            mozjpeg: [`-optimize`, `-progressive`],
+            gifsicle: [`--optimize`],
+            svgo: [`--enable`, `cleanupIDs`, `--disable`, `convertColors`],
             quiet: false
         }))
         .pipe(dest(`prod/img`));