updated benchmark table

with figures from v1.4.5

diff --git a/index.html b/index.html
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@@ -87,11 +87,11 @@
 Benchmarks
 ----------
 
-For comparison, several fast compression algorithms were tested and compared
-on a server running Linux Debian (`Linux version 4.14.0-3-amd64`),
-with a Core i7-6700K CPU @ 4.0GHz,
+For reference, several fast compression algorithms were tested and compared
+on a server running Arch Linux (`Linux version 5.5.11-arch1-1`),
+with a Core i9-9900K CPU @ 5.0GHz,
 using [lzbench], an open-source in-memory benchmark by @inikep
-compiled with [gcc] 7.3.0,
+compiled with [gcc] 9.3.0,
 on the [Silesia compression corpus].
 
 [lzbench]: https://github.com/inikep/lzbench
@@ -100,17 +100,24 @@ on the [Silesia compression corpus].
 
 | Compressor name         | Ratio | Compression| Decompress.|
 | ---------------         | ------| -----------| ---------- |
-| **zstd 1.3.4 -1**       | 2.877 |   470 MB/s |  1380 MB/s |
-| zlib 1.2.11 -1          | 2.743 |   110 MB/s |   400 MB/s |
-| brotli 1.0.2 -0         | 2.701 |   410 MB/s |   430 MB/s |
-| quicklz 1.5.0 -1        | 2.238 |   550 MB/s |   710 MB/s |
-| lzo1x 2.09 -1           | 2.108 |   650 MB/s |   830 MB/s |
-| lz4 1.8.1               | 2.101 |   750 MB/s |  3700 MB/s |
-| snappy 1.1.4            | 2.091 |   530 MB/s |  1800 MB/s |
-| lzf 3.6 -1              | 2.077 |   400 MB/s |   860 MB/s |
+| **zstd 1.4.5 -1**       | 2.884 |   500 MB/s |  1660 MB/s |
+| [zlib] 1.2.11 -1        | 2.743 |    90 MB/s |   400 MB/s |
+| brotli 1.0.7 -0         | 2.703 |   400 MB/s |   450 MB/s |
+| **zstd 1.4.5 --fast=1** | 2.434 |   570 MB/s |  2200 MB/s |
+| **zstd 1.4.5 --fast=3** | 2.312 |   640 MB/s |  2300 MB/s |
+| quicklz 1.5.0 -1        | 2.238 |   560 MB/s |   710 MB/s |
+| **zstd 1.4.5 --fast=5** | 2.178 |   700 MB/s |  2420 MB/s |
+| lzo1x 2.10 -1           | 2.106 |   690 MB/s |   820 MB/s |
+| [lz4] 1.9.2             | 2.101 |   740 MB/s |  4530 MB/s |
+| lzf 3.6 -1              | 2.077 |   410 MB/s |   860 MB/s |
+| snappy 1.1.8            | 2.073 |   560 MB/s |  1790 MB/s |
 
 [zlib]:http://www.zlib.net/
-[LZ4]: http://www.lz4.org/
+[lz4]: http://www.lz4.org/
+
+The negative compression levels, specified with `--fast=#`,
+offer faster compression and decompression speed in exchange for some loss in
+compression ratio compared to level 1, as seen in the table above.
 
 Zstd can trade compression speed for stronger compression ratios.
 It is configurable by small increment.
@@ -126,7 +133,7 @@ on the [Silesia compression corpus].
 
 | Compression Speed vs Ratio | Decompression Speed |
 | ---------------------------|-------------------- |
-| <img src="https://raw.githubusercontent.com/facebook/zstd/dev/doc/images/CSpeed2.png" alt="Compression Speed vs Ratio" style="height:500px;"> | <img src="https://raw.githubusercontent.com/facebook/zstd/dev/doc/images/DSpeed3.png" alt="Decompression Speed" style="height:500px;">
+| <img src="https://raw.githubusercontent.com/facebook/zstd/v1.3.4/doc/images/CSpeed2.png" alt="Compression Speed vs Ratio" style="height:500px;"> | <img src="https://raw.githubusercontent.com/facebook/zstd/v1.3.4/doc/images/DSpeed3.png" alt="Decompression Speed" style="height:500px;">
 
 Several algorithms can produce higher compression ratio but at slower speed, falling outside of the graph.
 For a larger picture including very slow modes, [click on this link](https://raw.githubusercontent.com/facebook/zstd/master/doc/images/DCspeed5.png) .