update dependencies and autoprefixer config

.browserslistrc

@@ -0,0 +1,13 @@
+# https://github.com/browserslist/browserslist#readme
+
+>= 1%
+last 1 major version
+not dead
+Chrome >= 60
+Firefox >= 60
+Edge >= 15.15063
+Explorer 11
+iOS >= 10
+Safari >= 10
+Android >= 6
+not ExplorerMobile <= 11

css/clean-blog.css

@@ -1,5 +1,5 @@
 /*!
- * Start Bootstrap - Clean Blog v5.0.7 (https://startbootstrap.com/template-overviews/clean-blog)
+ * Start Bootstrap - Clean Blog v5.0.8 (https://startbootstrap.com/template-overviews/clean-blog)
  * Copyright 2013-2019 Start Bootstrap
  * Licensed under MIT (https://github.com/BlackrockDigital/startbootstrap-clean-blog/blob/master/LICENSE)
  */
@@ -31,7 +31,6 @@ h6 {
 
 a {
   color: #212529;
-  -webkit-transition: all 0.2s;
   transition: all 0.2s;
 }
 
@@ -138,21 +137,16 @@ img::-moz-selection {
 
 @media only screen and (min-width: 992px) {
   #mainNav {
-    -webkit-transition: background-color 0.2s;
     transition: background-color 0.2s;
     /* Force Hardware Acceleration in WebKit */
-    -webkit-transform: translate3d(0, 0, 0);
     transform: translate3d(0, 0, 0);
     -webkit-backface-visibility: hidden;
   }
   #mainNav.is-fixed {
     /* when the user scrolls down, we hide the header right above the viewport */
     position: fixed;
     top: -67px;
-    -webkit-transition: -webkit-transform 0.2s;
-    transition: -webkit-transform 0.2s;
     transition: transform 0.2s;
-    transition: transform 0.2s, -webkit-transform 0.2s;
     border-bottom: 1px solid white;
     background-color: rgba(255, 255, 255, 0.9);
   }
@@ -170,7 +164,6 @@ img::-moz-selection {
   }
   #mainNav.is-visible {
     /* if the user changes the scrolling direction, we show the header */
-    -webkit-transform: translate3d(0, 100%, 0);
     transform: translate3d(0, 100%, 0);
   }
 }
@@ -335,7 +328,6 @@ header.masthead .post-heading .meta a {
   border: none;
   border-radius: 0;
   background: none;
-  -webkit-box-shadow: none !important;
   box-shadow: none !important;
   font-family: 'Lora', 'Times New Roman', serif;
 }
@@ -354,7 +346,6 @@ header.masthead .post-heading .meta a {
   top: 2em;
   display: block;
   margin: 0;
-  -webkit-transition: top 0.3s ease, opacity 0.3s ease;
   transition: top 0.3s ease, opacity 0.3s ease;
   vertical-align: middle;
   vertical-align: baseline;

gulpfile.js

@@ -78,7 +78,6 @@ function css() {
     }))
     .on("error", sass.logError)
     .pipe(autoprefixer({
-      browsers: ['last 2 versions'],
       cascade: false
     }))
     .pipe(header(banner, {