Add HSTDP 2018.1-01

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diff --git a/hstdp/2018.1/software_updates.md b/hstdp/2018.1/software_updates.md
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+# HSTCAL Version 2.0.0rc3
+
+The following updates, specified in separate sections for each instrument,  have been included with this release. This release is presented as [HSTDP-2018.1 milestones](https://github.com/spacetelescope/hstcal/milestone/6).
+
+
+
+## HSTCAL package updates
+- The separate trailer file support routines used by ACS, WFC3, and STIS were consolidated into a single file, and are now part of libhstcallib.a.
+
+## HSTIO
+[HSTDP-2018.1 Milestones](https://github.com/spacetelescope/hstcal/issues?utf8=%E2%9C%93&q=label%3Ahstio+milestone%3AHSTDP-2018.1+)
+- Improvements in robustness and maintainability have been made to the infrastructure software (HSTIO) and libraries which are the foundation for the pipelines.  
+
+
+## ACS
+[HSTDP-2018.1 Milestones](https://github.com/spacetelescope/hstcal/issues?utf8=%E2%9C%93&q=label%3AACS+milestone%3AHSTDP-2018.1+), [Data Changes](https://github.com/spacetelescope/hstcal/pulls?utf8=%E2%9C%93&q=is%3Apr+is%3Aclosed+label%3Aacs+label%3Achanges-data+milestone%3AHSTDP-2018.1+)
+
+- CALACS updates to Version 10.0.0 due to the modifications imposed by the upgraded ACSREJ algorithm.
+- An updated ACSREJ algorithm was implemented where all calculations are now done in electrons versus DN.  The threshold computation uses the ERR arrays to account for post-flash noise [PR#2](https://github.com/spacetelescope/hstcal/pull/2).
+- CALACS now uses the amp-dependent read noise as the threshold to determine if a pixel has enough signal-to-noise ratio such that a reasonable correction can be applied [PR#258](https://github.com/spacetelescope/hstcal/pull/258).
+- A bug fix has been implemented which is only applicable for RAWs with PCTECORR=PERFORM for ASNs used for cosmic ray rejection. In this case the CR rejected output (CRJ) previously used the wrong dark; it used the CTE-corrected dark. This has been addressed, and the CRJ product is now correct utilizing the non-CTE corrected dark [PR#273](https://github.com/spacetelescope/hstcal/pull/273).
+- All BIAS files are now processed by CALACS to use only read noise (vs Poisson) for the computation of the ERR array as the date discriminant (pre- and post-SM4) has been removed [PR#288](https://github.com/spacetelescope/hstcal/pull/288).
+- The C interface to the ACSREJ standalone component of CALACS was modified for clarity.  The "newbias" option was renamed "readnoise_only".  The functionality associated with this option remains the same.
+
+- [x] Affects old data
+- [x] Users should re-retrieve affected datasets from the archive
+- [x] Updated reference files delivered by science team
+
+## STIS
+[HSTDP-2018.1 Milestones](https://github.com/spacetelescope/hstcal/issues?utf8=%E2%9C%93&q=label%3ASTIS+milestone%3AHSTDP-2018.1+)
+
+- calstis version 3.4.2
+- Bugs were addressed: memory leak, added --help option, ensure printing of syntax usage when necessary
+
+- [ ] Affects old data
+- [ ] Users should re-retrieve affected datasets from the archive
+- [ ] Updated reference files delivered by science team
+
+
+## WFC3
+[HSTDP-2018.1 Milestones](https://github.com/spacetelescope/hstcal/issues?utf8=%E2%9C%93&q=label%3AWFC3+milestone%3AHSTDP-2018.1+)
+
+- CALWF3 updates to Version 3.4.2 for this release.
+- A number of code robustness improvements (address memory leaks, fix detected bugs) were implemented.
+
+- [ ] Affects old data
+- [ ] Users should re-retrieve affected datasets from the archive
+- [ ] Updated reference files delivered by science team
+
+# Additional software included in this update
+- drizzlepac 2.1.21
+- stwcs 1.4.0
+- calcos 3.3.4
+- acstools 2.0.10
+